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<a name="cosh"></a>
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<div class="header">
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<p>
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Next: <a href="erf.html#erf" accesskey="n" rel="next">erf</a>, Previous: <a href="copysign.html#copysign" accesskey="p" rel="prev">copysign</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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<a name="cosh_002c-coshf_002d_002d_002dhyperbolic-cosine"></a>
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<h3 class="section">1.13 <code>cosh</code>, <code>coshf</code>—hyperbolic cosine</h3>
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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 cosh(double <var>x</var>);
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float coshf(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>cosh</code> computes the hyperbolic cosine of the argument <var>x</var>.
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<code>cosh(<var>x</var>)</code> is defined as
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</p><div class="smallexample">
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<pre class="smallexample"> (exp(x) + exp(-x))/2
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</pre></div>
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<p>Angles are specified in radians.
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<code>coshf</code> is identical, save that it takes and returns <code>float</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The computed value is returned. When the correct value would create
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an overflow, <code>cosh</code> returns the value <code>HUGE_VAL</code> with the
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appropriate sign, and the global value <code>errno</code> is set to <code>ERANGE</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>cosh</code> is ANSI.
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<code>coshf</code> is an extension.
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