Added buttons for inverse trig functions.

2 files changed, 323 insertions, 167 deletions

diff --git a/data/buttons-advanced.ui b/data/buttons-advanced.ui
index 6ac97a0..30f01ec 100644
--- a/data/buttons-advanced.ui
+++ b/data/buttons-advanced.ui
@@ -1,29 +1,35 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk+" version="2.16"/>
   <!-- interface-naming-policy toplevel-contextual -->
   <object class="GtkWindow" id="window1">
+    <property name="can_focus">False</property>
     <child>
       <object class="GtkVBox" id="button_panel">
         <property name="visible">True</property>
+        <property name="can_focus">False</property>
         <property name="spacing">6</property>
         <child>
           <object class="GtkHBox" id="hbox1">
             <property name="visible">True</property>
+            <property name="can_focus">False</property>
             <property name="spacing">6</property>
             <child>
               <object class="GtkComboBox" id="angle_units_combo">
                 <property name="visible">True</property>
+                <property name="can_focus">False</property>
                 <property name="focus_on_click">False</property>
               </object>
               <packing>
                 <property name="expand">False</property>
+                <property name="fill">True</property>
                 <property name="position">0</property>
               </packing>
             </child>
             <child>
               <object class="GtkLabel" id="angle_label">
                 <property name="visible">True</property>
+                <property name="can_focus">False</property>
                 <property name="xalign">1</property>
                 <property name="label" comments="Example content">3.14159 radians = 180 degrees</property>
                 <child internal-child="accessible">
@@ -34,57 +40,32 @@
                 </child>
               </object>
               <packing>
+                <property name="expand">True</property>
+                <property name="fill">True</property>
                 <property name="position">1</property>
               </packing>
             </child>
           </object>
           <packing>
             <property name="expand">False</property>
+            <property name="fill">True</property>
             <property name="position">0</property>
           </packing>
         </child>
         <child>
           <object class="GtkTable" id="button_table">
             <property name="visible">True</property>
+            <property name="can_focus">False</property>
             <property name="n_rows">5</property>
-            <property name="n_columns">10</property>
+            <property name="n_columns">11</property>
             <property name="homogeneous">True</property>
             <child>
-              <object class="GtkButton" id="calc_inverse_button">
-                <property name="visible">True</property>
-                <property name="can_focus">True</property>
-                <property name="receives_default">True</property>
-                <property name="focus_on_click">False</property>
-                <child internal-child="accessible">
-                  <object class="AtkObject" id="calc_inverse_button-atkobject">
-                    <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the inverse button">Inverse</property>
-                  </object>
-                </child>
-                <signal name="clicked" handler="button_cb"/>
-                <child>
-                  <object class="GtkLabel" id="label20">
-                    <property name="visible">True</property>
-                    <property name="label">&lt;i&gt;x&lt;/i&gt;&lt;sup&gt;&#x2212;1&lt;/sup&gt;</property>
-                    <property name="use_markup">True</property>
-                    <property name="justify">center</property>
-                  </object>
-                </child>
-              </object>
-              <packing>
-                <property name="left_attach">6</property>
-                <property name="right_attach">7</property>
-                <property name="top_attach">2</property>
-                <property name="bottom_attach">3</property>
-                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-              </packing>
-            </child>
-            <child>
               <object class="GtkButton" id="calc_factor_button">
-                <property name="label">a&#xD7;b</property>
+                <property name="label">a×b</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
@@ -92,7 +73,7 @@
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the factorize button">Factorize</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="factorize_cb"/>
+                <signal name="clicked" handler="factorize_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">5</property>
@@ -104,43 +85,15 @@
               </packing>
             </child>
             <child>
-              <object class="GtkButton" id="calc_factorial_button">
-                <property name="visible">True</property>
-                <property name="can_focus">True</property>
-                <property name="receives_default">True</property>
-                <property name="focus_on_click">False</property>
-                <child internal-child="accessible">
-                  <object class="AtkObject" id="calc_factorial_button-atkobject">
-                    <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the factorial button">Factorial</property>
-                  </object>
-                </child>
-                <signal name="clicked" handler="button_cb"/>
-                <child>
-                  <object class="GtkLabel" id="label14">
-                    <property name="visible">True</property>
-                    <property name="label">&lt;i&gt;x&lt;/i&gt;!</property>
-                    <property name="use_markup">True</property>
-                  </object>
-                </child>
-              </object>
-              <packing>
-                <property name="left_attach">7</property>
-                <property name="right_attach">8</property>
-                <property name="top_attach">2</property>
-                <property name="bottom_attach">3</property>
-                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-              </packing>
-            </child>
-            <child>
               <object class="GtkButton" id="calc_imaginary_portion_button">
                 <property name="label">Im</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">7</property>
@@ -156,12 +109,14 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="imaginary_label">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <property name="label">&lt;i&gt;i&lt;/i&gt;</property>
                     <property name="use_markup">True</property>
                   </object>
@@ -182,9 +137,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="top_attach">2</property>
@@ -199,9 +155,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="top_attach">1</property>
@@ -216,9 +173,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">1</property>
@@ -235,9 +193,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">2</property>
@@ -254,9 +213,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">1</property>
@@ -273,9 +233,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">2</property>
@@ -288,13 +249,14 @@
             </child>
             <child>
               <object class="GtkButton" id="calc_divide_button">
-                <property name="label">&#xF7;</property>
+                <property name="label">÷</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">3</property>
@@ -311,9 +273,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="top_attach">3</property>
@@ -328,9 +291,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">1</property>
@@ -347,9 +311,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="top_attach">4</property>
@@ -364,9 +329,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="numeric_point_cb"/>
+                <signal name="clicked" handler="numeric_point_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">1</property>
@@ -383,9 +349,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="digit_cb"/>
+                <signal name="clicked" handler="digit_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">2</property>
@@ -398,13 +365,14 @@
             </child>
             <child>
               <object class="GtkButton" id="calc_multiply_button">
-                <property name="label">&#xD7;</property>
+                <property name="label">×</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">3</property>
@@ -417,13 +385,14 @@
             </child>
             <child>
               <object class="GtkButton" id="calc_subtract_button">
-                <property name="label">&#x2212;</property>
+                <property name="label">−</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="subtract_cb"/>
+                <signal name="clicked" handler="subtract_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">3</property>
@@ -440,9 +409,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">3</property>
@@ -459,9 +429,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="solve_cb"/>
+                <signal name="clicked" handler="solve_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">4</property>
@@ -478,9 +449,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="clear_cb"/>
+                <signal name="clicked" handler="clear_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">5</property>
@@ -494,17 +466,19 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="calc_subscript_button-atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the subscript mode button">Subscript</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="set_subscript_cb"/>
+                <signal name="clicked" handler="set_subscript_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="label4">
                     <property name="visible">True</property>
-                    <property name="label">&#x2193;n</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">↓n</property>
                     <property name="use_markup">True</property>
                   </object>
                 </child>
@@ -519,17 +493,19 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="calc_superscript_button-atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the superscript mode button">Superscript</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="set_superscript_cb"/>
+                <signal name="clicked" handler="set_superscript_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="label3">
                     <property name="visible">True</property>
-                    <property name="label">&#x2191;n</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">↑n</property>
                     <property name="use_markup">True</property>
                   </object>
                 </child>
@@ -546,6 +522,7 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
@@ -553,11 +530,12 @@
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the scientific exponent button">Scientific Exponent</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="exponent_cb"/>
+                <signal name="clicked" handler="exponent_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="label2">
                     <property name="visible">True</property>
-                    <property name="label">&#xD7;10&lt;sup&gt;&lt;i&gt;y&lt;/i&gt;&lt;/sup&gt;</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">×10&lt;sup&gt;&lt;i&gt;y&lt;/i&gt;&lt;/sup&gt;</property>
                     <property name="use_markup">True</property>
                   </object>
                 </child>
@@ -575,9 +553,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">3</property>
@@ -592,9 +571,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">4</property>
@@ -611,9 +591,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">5</property>
@@ -629,32 +610,39 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="calc_recall_button-atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the recall value button">Recall</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="recall_cb"/>
+                <signal name="clicked" handler="recall_cb" swapped="no"/>
                 <child>
                   <object class="GtkHBox" id="hbox19">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <child>
                       <object class="GtkLabel" id="label22">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="The label on the memory recall button">&#x2190; R</property>
+                        <property name="can_focus">False</property>
+                        <property name="label" translatable="yes" comments="The label on the memory recall button">← R</property>
                       </object>
                       <packing>
+                        <property name="expand">True</property>
+                        <property name="fill">True</property>
                         <property name="position">0</property>
                       </packing>
                     </child>
                     <child>
                       <object class="GtkArrow" id="arrow13">
                         <property name="visible">True</property>
+                        <property name="can_focus">False</property>
                         <property name="arrow_type">down</property>
                       </object>
                       <packing>
                         <property name="expand">False</property>
+                        <property name="fill">True</property>
                         <property name="position">1</property>
                       </packing>
                     </child>
@@ -675,32 +663,39 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="calc_store_button-atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the store value button">Store</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="store_cb"/>
+                <signal name="clicked" handler="store_cb" swapped="no"/>
                 <child>
                   <object class="GtkHBox" id="hbox20">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <child>
                       <object class="GtkLabel" id="label23">
                         <property name="visible">True</property>
-                        <property name="label" translatable="yes" comments="The label on the memory store button">&#x2192; R</property>
+                        <property name="can_focus">False</property>
+                        <property name="label" translatable="yes" comments="The label on the memory store button">→ R</property>
                       </object>
                       <packing>
+                        <property name="expand">True</property>
+                        <property name="fill">True</property>
                         <property name="position">0</property>
                       </packing>
                     </child>
                     <child>
                       <object class="GtkArrow" id="arrow14">
                         <property name="visible">True</property>
+                        <property name="can_focus">False</property>
                         <property name="arrow_type">down</property>
                       </object>
                       <packing>
                         <property name="expand">False</property>
+                        <property name="fill">True</property>
                         <property name="position">1</property>
                       </packing>
                     </child>
@@ -717,44 +712,15 @@
               </packing>
             </child>
             <child>
-              <object class="GtkButton" id="calc_abs_button">
-                <property name="visible">True</property>
-                <property name="can_focus">True</property>
-                <property name="receives_default">True</property>
-                <property name="use_underline">True</property>
-                <property name="focus_on_click">False</property>
-                <child internal-child="accessible">
-                  <object class="AtkObject" id="calc_abs_button-atkobject">
-                    <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the absolute value button">Absolute Value</property>
-                  </object>
-                </child>
-                <signal name="clicked" handler="button_cb"/>
-                <child>
-                  <object class="GtkLabel" id="label1">
-                    <property name="visible">True</property>
-                    <property name="label">|&lt;i&gt;x&lt;/i&gt;|</property>
-                    <property name="use_markup">True</property>
-                  </object>
-                </child>
-              </object>
-              <packing>
-                <property name="left_attach">8</property>
-                <property name="right_attach">9</property>
-                <property name="top_attach">2</property>
-                <property name="bottom_attach">3</property>
-                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-              </packing>
-            </child>
-            <child>
               <object class="GtkButton" id="calc_real_portion_button">
                 <property name="label">Re</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">6</property>
@@ -771,9 +737,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">8</property>
@@ -785,33 +752,15 @@
               </packing>
             </child>
             <child>
-              <object class="GtkButton" id="calc_arg_button">
-                <property name="label">Arg</property>
-                <property name="visible">True</property>
-                <property name="can_focus">True</property>
-                <property name="receives_default">True</property>
-                <property name="use_underline">True</property>
-                <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
-              </object>
-              <packing>
-                <property name="left_attach">9</property>
-                <property name="right_attach">10</property>
-                <property name="top_attach">2</property>
-                <property name="bottom_attach">3</property>
-                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
-              </packing>
-            </child>
-            <child>
               <object class="GtkButton" id="calc_natural_logarithm_button">
                 <property name="label">ln</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">9</property>
@@ -828,8 +777,9 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">8</property>
@@ -845,16 +795,18 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="calc_x_pow_y_button-atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the exponentiation (x to the power of y) button">Exponent</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="x_pow_y_label">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <property name="label">&lt;i&gt;x&lt;/i&gt;&lt;sup&gt;&lt;i&gt;y&lt;/i&gt;&lt;/sup&gt;</property>
                     <property name="use_markup">True</property>
                   </object>
@@ -871,13 +823,14 @@
             </child>
             <child>
               <object class="GtkButton" id="calc_root_button">
-                <property name="label">&#x221A;</property>
+                <property name="label">√</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">7</property>
@@ -894,9 +847,10 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="undo_cb"/>
+                <signal name="clicked" handler="undo_cb" swapped="no"/>
               </object>
               <packing>
                 <property name="left_attach">4</property>
@@ -910,13 +864,15 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="pi_label">
                     <property name="visible">True</property>
-                    <property name="label">&#x3C0;</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">π</property>
                     <property name="use_markup">True</property>
                   </object>
                 </child>
@@ -935,12 +891,14 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="use_underline">True</property>
                 <property name="focus_on_click">False</property>
-                <signal name="clicked" handler="button_cb"/>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
                 <child>
                   <object class="GtkLabel" id="eulers_number_label">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <property name="label">&lt;i&gt;e&lt;/i&gt;</property>
                     <property name="use_markup">True</property>
                   </object>
@@ -958,7 +916,8 @@
             <child>
               <object class="GtkTable" id="table1">
                 <property name="visible">True</property>
-                <property name="n_rows">2</property>
+                <property name="can_focus">False</property>
+                <property name="n_rows">3</property>
                 <property name="n_columns">3</property>
                 <property name="homogeneous">True</property>
                 <child>
@@ -967,8 +926,9 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
                     <property name="focus_on_click">False</property>
-                    <signal name="clicked" handler="button_cb"/>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
                   </object>
                   <packing>
                     <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
@@ -981,8 +941,9 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
                     <property name="focus_on_click">False</property>
-                    <signal name="clicked" handler="button_cb"/>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -997,8 +958,9 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
                     <property name="focus_on_click">False</property>
-                    <signal name="clicked" handler="button_cb"/>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
                   </object>
                   <packing>
                     <property name="left_attach">2</property>
@@ -1013,8 +975,9 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
                     <property name="focus_on_click">False</property>
-                    <signal name="clicked" handler="button_cb"/>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
                   </object>
                   <packing>
                     <property name="top_attach">1</property>
@@ -1029,8 +992,9 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
                     <property name="focus_on_click">False</property>
-                    <signal name="clicked" handler="button_cb"/>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>
@@ -1047,8 +1011,9 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
                     <property name="focus_on_click">False</property>
-                    <signal name="clicked" handler="button_cb"/>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
                   </object>
                   <packing>
                     <property name="left_attach">2</property>
@@ -1059,11 +1024,66 @@
                     <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
                   </packing>
                 </child>
+                <child>
+                  <object class="GtkButton" id="calc_inverse_cosine_button">
+                    <property name="label" translatable="yes">acos</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
+                    <property name="focus_on_click">False</property>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
+                  </object>
+                  <packing>
+                    <property name="top_attach">2</property>
+                    <property name="bottom_attach">3</property>
+                    <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                    <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkButton" id="calc_inverse_sine_button">
+                    <property name="label" translatable="yes">asin</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
+                    <property name="focus_on_click">False</property>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
+                  </object>
+                  <packing>
+                    <property name="left_attach">1</property>
+                    <property name="right_attach">2</property>
+                    <property name="top_attach">2</property>
+                    <property name="bottom_attach">3</property>
+                    <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                    <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkButton" id="calc_inverse_tangent_button">
+                    <property name="label" translatable="yes">atan</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">True</property>
+                    <property name="use_action_appearance">False</property>
+                    <property name="focus_on_click">False</property>
+                    <signal name="clicked" handler="button_cb" swapped="no"/>
+                  </object>
+                  <packing>
+                    <property name="left_attach">2</property>
+                    <property name="right_attach">3</property>
+                    <property name="top_attach">2</property>
+                    <property name="bottom_attach">3</property>
+                    <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                    <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                  </packing>
+                </child>
               </object>
               <packing>
                 <property name="left_attach">6</property>
                 <property name="right_attach">10</property>
-                <property name="bottom_attach">2</property>
+                <property name="bottom_attach">3</property>
               </packing>
             </child>
             <child>
@@ -1071,32 +1091,39 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
                 <property name="focus_on_click">False</property>
                 <child internal-child="accessible">
                   <object class="AtkObject" id="calc_function_button-atkobject">
                     <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the store value button">Store</property>
                   </object>
                 </child>
-                <signal name="clicked" handler="function_cb"/>
+                <signal name="clicked" handler="function_cb" swapped="no"/>
                 <child>
                   <object class="GtkHBox" id="hbox2">
                     <property name="visible">True</property>
+                    <property name="can_focus">False</property>
                     <child>
                       <object class="GtkLabel" id="label5">
                         <property name="visible">True</property>
+                        <property name="can_focus">False</property>
                         <property name="label">f(x)</property>
                       </object>
                       <packing>
+                        <property name="expand">True</property>
+                        <property name="fill">True</property>
                         <property name="position">0</property>
                       </packing>
                     </child>
                     <child>
                       <object class="GtkArrow" id="arrow1">
                         <property name="visible">True</property>
+                        <property name="can_focus">False</property>
                         <property name="arrow_type">down</property>
                       </object>
                       <packing>
                         <property name="expand">False</property>
+                        <property name="fill">True</property>
                         <property name="position">1</property>
                       </packing>
                     </child>
@@ -1112,8 +1139,128 @@
                 <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
               </packing>
             </child>
+            <child>
+              <object class="GtkButton" id="calc_inverse_button">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
+                <property name="focus_on_click">False</property>
+                <child internal-child="accessible">
+                  <object class="AtkObject" id="calc_inverse_button-atkobject">
+                    <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the inverse button">Inverse</property>
+                  </object>
+                </child>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
+                <child>
+                  <object class="GtkLabel" id="label20">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">&lt;i&gt;x&lt;/i&gt;&lt;sup&gt;−1&lt;/sup&gt;</property>
+                    <property name="use_markup">True</property>
+                    <property name="justify">center</property>
+                  </object>
+                </child>
+              </object>
+              <packing>
+                <property name="left_attach">10</property>
+                <property name="right_attach">11</property>
+                <property name="top_attach">1</property>
+                <property name="bottom_attach">2</property>
+                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="calc_factorial_button">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
+                <property name="focus_on_click">False</property>
+                <child internal-child="accessible">
+                  <object class="AtkObject" id="calc_factorial_button-atkobject">
+                    <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the factorial button">Factorial</property>
+                  </object>
+                </child>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
+                <child>
+                  <object class="GtkLabel" id="label14">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">&lt;i&gt;x&lt;/i&gt;!</property>
+                    <property name="use_markup">True</property>
+                  </object>
+                </child>
+              </object>
+              <packing>
+                <property name="left_attach">10</property>
+                <property name="right_attach">11</property>
+                <property name="top_attach">2</property>
+                <property name="bottom_attach">3</property>
+                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="calc_abs_button">
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
+                <property name="use_underline">True</property>
+                <property name="focus_on_click">False</property>
+                <child internal-child="accessible">
+                  <object class="AtkObject" id="calc_abs_button-atkobject">
+                    <property name="AtkObject::accessible-name" translatable="yes" comments="Accessible name for the absolute value button">Absolute Value</property>
+                  </object>
+                </child>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
+                <child>
+                  <object class="GtkLabel" id="label1">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label">|&lt;i&gt;x&lt;/i&gt;|</property>
+                    <property name="use_markup">True</property>
+                  </object>
+                </child>
+              </object>
+              <packing>
+                <property name="left_attach">10</property>
+                <property name="right_attach">11</property>
+                <property name="top_attach">3</property>
+                <property name="bottom_attach">4</property>
+                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="calc_arg_button">
+                <property name="label">Arg</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="use_action_appearance">False</property>
+                <property name="use_underline">True</property>
+                <property name="focus_on_click">False</property>
+                <signal name="clicked" handler="button_cb" swapped="no"/>
+              </object>
+              <packing>
+                <property name="left_attach">10</property>
+                <property name="right_attach">11</property>
+                <property name="top_attach">4</property>
+                <property name="bottom_attach">5</property>
+                <property name="x_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+                <property name="y_options">GTK_EXPAND | GTK_SHRINK | GTK_FILL</property>
+              </packing>
+            </child>
+            <child>
+              <placeholder/>
+            </child>
           </object>
           <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
             <property name="position">1</property>
           </packing>
         </child>
diff --git a/src/math-buttons.c b/src/math-buttons.c
index 3c71ed3..d33422b 100644
--- a/src/math-buttons.c
+++ b/src/math-buttons.c
@@ -178,6 +178,15 @@ static ButtonData button_data[] = {
     {"tangent",            "tan ", FUNCTION,
       /* Tooltip for the tangent button */
       N_("Tangent")},
+    {"inverse_sine", "asin", FUNCTION,
+      /* Tooltip for the inverse sine button */
+      N_("Inverse Sine")},
+    {"inverse_cosine", "acos", FUNCTION,
+      /* Tooltip for the inverse cosine button */
+      N_("Inverse Cosine")},
+    {"inverse_tangent", "atan", FUNCTION,
+      /* Tooltip for the inverse tangent button */
+      N_("Inverse Tangent")},
     {"hyperbolic_sine",    "sinh ", FUNCTION,
       /* Tooltip for the hyperbolic sine button */
       N_("Hyperbolic Sine")},