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<a name="casin_002c-casinf_002d_002d_002dcomplex-arc-sine"></a>
<h3 class="section">2.5 <code>casin</code>, <code>casinf</code>—complex arc sine</h3>
<a name="index-casin"></a>
<a name="index-casinf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <complex.h>
double complex casin(double complex <var>z</var>);
float complex casinf(float complex <var>z</var>);
</pre></div>
<p><strong>Description</strong><br>
These functions compute the complex arc sine of <var>z</var>,
with branch cuts outside the interval [-1, +1] along the real axis.
</p>
<p><code>casinf</code> is identical to <code>casin</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 sine value, in the range
of a strip mathematically unbounded along the imaginary axis
and in the interval [-pi/2, +pi/2] along the real axis.
</p>
<br>
<p><strong>Portability</strong><br>
<code>casin</code> and <code>casinf</code> are ISO C99
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