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95 lines
3.5 KiB
HTML
95 lines
3.5 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>acosh (LIBM)</title>
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<meta name="description" content="acosh (LIBM)">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Math.html#Math" rel="up" title="Math">
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<link href="asin.html#asin" rel="next" title="asin">
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</head>
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<body lang="en">
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<a name="acosh"></a>
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<div class="header">
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<p>
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Next: <a href="asin.html#asin" accesskey="n" rel="next">asin</a>, Previous: <a href="acos.html#acos" accesskey="p" rel="prev">acos</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="acosh_002c-acoshf_002d_002d_002dinverse-hyperbolic-cosine"></a>
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<h3 class="section">1.4 <code>acosh</code>, <code>acoshf</code>—inverse hyperbolic cosine</h3>
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<a name="index-acosh"></a>
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<a name="index-acoshf"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <math.h>
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double acosh(double <var>x</var>);
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float acoshf(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>acosh</code> calculates the inverse hyperbolic cosine of <var>x</var>.
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<code>acosh</code> is defined as
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</p><div class="smallexample">
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<pre class="smallexample"> log(<var>x</var> + sqrt(<var>x</var>*<var>x</var>-1))
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</pre></div>
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<p><var>x</var> must be a number greater than or equal to 1.
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</p>
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<p><code>acoshf</code> is identical, other than taking and returning floats.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>acosh</code> and <code>acoshf</code> return the calculated value. If <var>x</var>
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less than 1, the return value is NaN and <code>errno</code> is set to <code>EDOM</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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Neither <code>acosh</code> nor <code>acoshf</code> are ANSI C. They are not recommended
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for portable programs.
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</p>
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