<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" type="guide" id="trigonometry" xml:lang="fr">

    <info>
        <link type="guide" xref="index#equation"/>
    
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Vincent Renardias</mal:name>
      <mal:email>vincent@ldsol.com</mal:email>
      <mal:years>1998-2000.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Joaquim Fellmann</mal:name>
      <mal:email>joaquim@hrnet.fr</mal:email>
      <mal:years>2000.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Christophe Merlet</mal:name>
      <mal:email>redfox@redfoxcenter.org</mal:email>
      <mal:years>2000-2006.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Christophe Fergeau</mal:name>
      <mal:email>teuf@users.sourceforge.net</mal:email>
      <mal:years>2002-2003.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Sun G11n</mal:name>
      <mal:email>gnome_int_l10n@ireland.sun.com</mal:email>
      <mal:years>2002.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Robert-André Mauchin</mal:name>
      <mal:email>zebob.m@pengzone.org</mal:email>
      <mal:years>2006-2008.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Stéphane Raimbault</mal:name>
      <mal:email>stephane.raimbault@gmail.com</mal:email>
      <mal:years>2007.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Yannick Tailliez</mal:name>
      <mal:email>ytdispatch-libre@yahoo.com</mal:email>
      <mal:years>2008.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Claude Paroz</mal:name>
      <mal:email>claude@2xlibre.net</mal:email>
      <mal:years>2008-2010.</mal:years>
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    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Gérard Baylard</mal:name>
      <mal:email>gerard dot b at bbox dot fr</mal:email>
      <mal:years>2010</mal:years>
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  </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>
