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- <a name="acos_002c-acosf_002d_002d_002darc-cosine"></a>
- <h3 class="section">1.3 <code>acos</code>, <code>acosf</code>—arc cosine</h3>
- <a name="index-acos"></a>
- <a name="index-acosf"></a>
- <p><strong>Synopsis</strong>
- </p><div class="example">
- <pre class="example">#include <math.h>
- double acos(double <var>x</var>);
- float acosf(float <var>x</var>);
-
- </pre></div>
- <p><strong>Description</strong><br>
- </p>
- <p><code>acos</code> computes the inverse cosine (arc cosine) of the input value.
- Arguments to <code>acos</code> must be in the range -1 to 1.
- </p>
- <p><code>acosf</code> is identical to <code>acos</code>, except that it performs
- its calculations on <code>floats</code>.
- </p>
- <br>
- <p><strong>Returns</strong><br>
- <code>acos</code> and <code>acosf</code> return values in radians, in the range of 0 to pi.
- </p>
- <p>If <var>x</var> is not between -1 and 1, the returned value is NaN
- (not a number), and the global variable <code>errno</code> is set to <code>EDOM</code>.
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