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+<page xmlns="http://projectmallard.org/1.0/"
+      type="guide"
+      id="function">
+
+    <info>
+        <link type="guide" xref="index#equation"/>
+    </info>
+
+	<title>Functions</title>
+    
+    <p>
+    Functions can be used by inserting the name of the function followed by the function argument.
+    If the argument is not a number or <link xref="variable">variable</link> then use parenthesis around the argument.
+    </p>
+    <example>
+    <p>
+    sin 30
+    </p>
+    <p>
+    abs (5−9)
+    </p>
+    </example>
+    <p>
+    The following functions are defined.
+    </p>
+    <table>
+    <tr>
+    <td><p>abs</p></td>
+    <td><p><link xref="absolute">Absolute Value</link></p></td>
+    </tr>
+    <tr>
+    <td><p>cos</p></td>
+    <td><p><link xref="trigonometry">Cosine</link></p></td>
+    </tr>
+    <tr>
+    <td><p>cosh</p></td>
+    <td><p><link xref="trigonometry">Hyperbolic Cosine</link></p></td>
+    </tr>
+    <tr>
+    <td><p>frac</p></td>
+    <td><p>Fractional Component</p></td>
+    </tr>
+    <tr>
+    <td><p>int</p></td>
+    <td><p>Integer Component</p></td>
+    </tr>
+    <tr>
+    <td><p>ln</p></td>
+    <td><p><link xref="logarithm">Natural Logarithm</link></p></td>
+    </tr>
+    <tr>
+    <td><p>log</p></td>
+    <td><p><link xref="logarithm">Logarithm</link></p></td>
+    </tr>
+    <tr>
+    <td><p>not</p></td>
+    <td><p><link xref="boolean">Boolean NOT</link></p></td>
+    </tr>
+    <tr>
+    <td><p>ones</p></td>
+    <td><p>Ones complement</p></td>
+    </tr>
+    <tr>
+    <td><p>sin</p></td>
+    <td><p><link xref="trigonometry">Sine</link></p></td>
+    </tr>
+    <tr>
+    <td><p>sinh</p></td>
+    <td><p><link xref="trigonometry">Hyperbolic Sine</link></p></td>
+    </tr>
+    <tr>
+    <td><p>sqrt</p></td>
+    <td><p><link xref="power">Square Root</link></p></td>
+    </tr>
+    <tr>
+    <td><p>tan</p></td>
+    <td><p><link xref="trigonometry">Tangent</link></p></td>
+    </tr>
+    <tr>
+    <td><p>tanh</p></td>
+    <td><p><link xref="trigonometry">Hyperbolic Tangent</link></p></td>
+    </tr>
+    <tr>
+    <td><p>twos</p></td>
+    <td><p>Twos complement</p></td>
+    </tr>
+    </table>
+    <p>
+    <app>GCalctool</app> does not support user-defined functions.
+    </p>
+</page>