<page xmlns="http://projectmallard.org/1.0/" type="guide" id="trigonometry"> <info> <link type="guide" xref="index#equation"/> </info> <title>Trigonometry</title> <p> Trigonometry can be performed using the sin, cos, and tan <link xref="function">function</link>. </p> <example> <p> sin 45 </p> </example> <p> The angle units used can be changed from the <guiseq><gui>Calculator</gui><gui>Preferences</gui></guiseq> menu. Trigonometry buttons are visible when in <link xref="mouse">Advanced mode</link>. </p> <p> Hyperbolic functions are available by adding "h" to the end of a function. </p> <example> <p> sinh 0.34 </p> </example> <p> Inverse functions are entered either using the inverse symbol ⁻¹ (<keyseq><key>Ctrl</key><key>I</key></keyseq>) or the "a" form of the function. The following two equations are equivalent. </p> <example> <p> sin⁻¹ 0.5 </p> <p> asin 0.5 </p> </example> <p> To enter <link xref="variable">π</link> with the keyboard use <keyseq><key>Ctrl</key><key>P</key></keyseq>. </p> </page>