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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>