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<a name="catanh"></a>
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Next: <a href="ccos.html#ccos" accesskey="n" rel="next">ccos</a>, Previous: <a href="catan.html#catan" accesskey="p" rel="prev">catan</a>, Up: <a href="Complex.html#Complex" accesskey="u" rel="up">Complex</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="catanh_002c-catanhf_002d_002d_002dcomplex-arc-hyperbolic-tangent"></a>
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<h3 class="section">2.8 <code>catanh</code>, <code>catanhf</code>—complex arc hyperbolic tangent</h3>
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<a name="index-catanh"></a>
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<a name="index-catanhf"></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 <complex.h>
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double complex catanh(double complex <var>z</var>);
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float complex catanhf(float complex <var>z</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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These functions compute the complex arc hyperbolic tan of <var>z</var>,
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with branch cuts outside the interval [-1, +1] along the
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real axis.
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</p>
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<p><code>catanhf</code> is identical to <code>catanh</code>, except that it performs
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its calculations on <code>floats complex</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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These functions return the complex arc hyperbolic tangent value,
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in the range of a strip mathematically unbounded along the
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real axis and in the interval [-i*p/2, +i*p/2] along the
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imaginary axis.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>catanh</code> and <code>catanhf</code> are ISO C99
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