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<a name="asin_002c-asinf_002d_002d_002darc-sine"></a>
<h3 class="section">1.5 <code>asin</code>, <code>asinf</code>&mdash;arc sine</h3>
<a name="index-asin"></a>
<a name="index-asinf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double asin(double <var>x</var>);
float asinf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
</p>
<p><code>asin</code> computes the inverse sine (arc sine) of the argument <var>x</var>.
Arguments to <code>asin</code> must be in the range -1 to 1.
</p>
<p><code>asinf</code> is identical to <code>asin</code>, other than taking and
returning floats.
</p>
<br>
<p><strong>Returns</strong><br>
<code>asin</code> returns values in radians, in the range of -pi/2 to pi/2.
</p>
<p>If <var>x</var> is not in the range -1 to 1, <code>asin</code> and <code>asinf</code>
return NaN (not a number), and the global variable <code>errno</code> is set to
<code>EDOM</code>.
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