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| <h3 class="section">1.5 <code>asin</code>, <code>asinf</code>—arc sine</h3> |
| |
| <p><a name="index-asin-9"></a><a name="index-asinf-10"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double asin(double <var>x</var>); |
| float asinf(float <var>x</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| |
| <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><code>asinf</code> is identical to <code>asin</code>, other than taking and |
| returning floats. |
| |
| <p>You can modify error handling for these routines using <code>matherr</code>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>asin</code> returns values in radians, in the range of -pi/2 to pi/2. |
| |
| <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), set the global variable <code>errno</code> to |
| <code>EDOM</code>, and issue a <code>DOMAIN error</code> message. |
| |
| <p>You can change this error treatment using <code>matherr</code>. |
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