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<a name="cosh_002c-coshf_002d_002d_002dhyperbolic-cosine"></a>
<h3 class="section">1.13 <code>cosh</code>, <code>coshf</code>&mdash;hyperbolic cosine</h3>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double cosh(double <var>x</var>);
float coshf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
</p>
<p><code>cosh</code> computes the hyperbolic cosine of the argument <var>x</var>.
<code>cosh(<var>x</var>)</code> is defined as 
</p><div class="smallexample">
<pre class="smallexample"> (exp(x) + exp(-x))/2
</pre></div>

<p>Angles are specified in radians.  
<code>coshf</code> is identical, save that it takes and returns <code>float</code>.
</p>
<br>
<p><strong>Returns</strong><br>
The computed value is returned.  When the correct value would create
an overflow,  <code>cosh</code> returns the value <code>HUGE_VAL</code> with the
appropriate sign, and the global value <code>errno</code> is set to <code>ERANGE</code>.
</p>
<br>
<p><strong>Portability</strong><br>
<code>cosh</code> is ANSI.  
<code>coshf</code> is an extension.
</p>
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