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<a name="cacos_002c-cacosf_002d_002d_002dcomplex-arc-cosine"></a>
<h3 class="section">2.2 <code>cacos</code>, <code>cacosf</code>&mdash;complex arc cosine</h3>
<a name="index-cacos"></a>
<a name="index-cacosf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;complex.h&gt;
double complex cacos(double complex <var>z</var>);
float complex cacosf(float complex <var>z</var>);

</pre></div>
<p><strong>Description</strong><br>
These functions compute the complex arc cosine of <var>z</var>,
with branch cuts outside the interval [-1, +1] along the real axis.
</p>
<p><code>cacosf</code> is identical to <code>cacos</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 cosine value, in the range
of a strip mathematically  unbounded  along the imaginary axis
and in the interval [0, pi] along the real axis.
</p>
<br>
<p><strong>Portability</strong><br>
<code>cacos</code> and <code>cacosf</code> are ISO C99
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