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94 lines
3.3 KiB
HTML
94 lines
3.3 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>tanh (LIBM)</title>
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<meta name="description" content="tanh (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="trunc.html#trunc" rel="next" title="trunc">
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<link href="tan.html#tan" rel="prev" title="tan">
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</head>
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<body lang="en">
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<a name="tanh"></a>
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<div class="header">
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<p>
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Next: <a href="trunc.html#trunc" accesskey="n" rel="next">trunc</a>, Previous: <a href="tan.html#tan" accesskey="p" rel="prev">tan</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="tanh_002c-tanhf_002d_002d_002dhyperbolic-tangent"></a>
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<h3 class="section">1.57 <code>tanh</code>, <code>tanhf</code>—hyperbolic tangent</h3>
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<a name="index-tanh"></a>
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<a name="index-tanhf"></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 tanh(double <var>x</var>);
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float tanhf(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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</p>
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<p><code>tanh</code> computes the hyperbolic tangent of
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the argument <var>x</var>. Angles are specified in radians.
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</p>
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<p><code>tanh(<var>x</var>)</code> is defined as
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</p><div class="smallexample">
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<pre class="smallexample"> sinh(<var>x</var>)/cosh(<var>x</var>)
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</pre></div>
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<p><code>tanhf</code> is identical, save that it takes and returns <code>float</code> values.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The hyperbolic tangent of <var>x</var> is returned.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>tanh</code> is ANSI C. <code>tanhf</code> is an extension.
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</p>
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<br>
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</body>
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