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<a name="catanh_002c-catanhf_002d_002d_002dcomplex-arc-hyperbolic-tangent"></a>
<h3 class="section">2.8 <code>catanh</code>, <code>catanhf</code>&mdash;complex arc hyperbolic tangent</h3>
<a name="index-catanh"></a>
<a name="index-catanhf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;complex.h&gt;
double complex catanh(double complex <var>z</var>);
float complex catanhf(float complex <var>z</var>);

</pre></div>
<p><strong>Description</strong><br>
These functions compute the complex arc hyperbolic tan of <var>z</var>,
with branch cuts outside the interval [-1, +1] along the
real axis.
</p>
<p><code>catanhf</code> is identical to <code>catanh</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 tangent value,
in the range of a strip mathematically unbounded along the
real axis and in the interval [-i*p/2, +i*p/2] along the
imaginary axis.
</p>
<br>
<p><strong>Portability</strong><br>
<code>catanh</code> and <code>catanhf</code> are ISO C99
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