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<a name="cacosh_002c-cacoshf_002d_002d_002dcomplex-arc-hyperbolic-cosine"></a>
<h3 class="section">2.3 <code>cacosh</code>, <code>cacoshf</code>&mdash;complex arc hyperbolic cosine</h3>
<a name="index-cacosh"></a>
<a name="index-cacoshf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;complex.h&gt;
double complex cacosh(double complex <var>z</var>);
float complex cacoshf(float complex <var>z</var>);

</pre></div>
<p><strong>Description</strong><br>
These functions compute the complex arc hyperbolic cosine of <var>z</var>,
with a branch cut at values less than 1 along the real axis.
</p>
<p><code>cacoshf</code> is identical to <code>cacosh</code>, except that it performs
its calculations on <code>floats complex</code>.
</p>
<br>
<p><strong>Returns</strong><br>
These functions return the complex arc hyperbolic cosine value, 
in the range of a half-strip of non-negative values along the 
real axis and in the interval [-i * pi, +i * pi] along the 
imaginary axis.
</p>
<br>
<p><strong>Portability</strong><br>
<code>cacosh</code> and <code>cacoshf</code> are ISO C99
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