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+<title>The GNU Fortran Compiler: ASIN</title>
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+<p>
+Next: <a href="ASIND.html#ASIND" accesskey="n" rel="next">ASIND</a>, Previous: <a href="ANY.html#ANY" accesskey="p" rel="previous">ANY</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="ASIN-_002d_002d_002d-Arcsine-function"></a>
+<h3 class="section">8.19 <code>ASIN</code> &mdash; Arcsine function</h3>
+<a name="index-ASIN"></a>
+<a name="index-DASIN"></a>
+<a name="index-trigonometric-function_002c-sine_002c-inverse"></a>
+<a name="index-sine_002c-inverse"></a>
+
+<dl compact="compact">
+<dt><em>Description</em>:</dt>
+<dd><p><code>ASIN(X)</code> computes the arcsine of its <var>X</var> (inverse of <code>SIN(X)</code>).
+</p>
+</dd>
+<dt><em>Standard</em>:</dt>
+<dd><p>Fortran 77 and later, for a complex argument Fortran 2008 or later
+</p>
+</dd>
+<dt><em>Class</em>:</dt>
+<dd><p>Elemental function
+</p>
+</dd>
+<dt><em>Syntax</em>:</dt>
+<dd><p><code>RESULT = ASIN(X)</code>
+</p>
+</dd>
+<dt><em>Arguments</em>:</dt>
+<dd><table>
+<tr><td width="15%"><var>X</var></td><td width="70%">The type shall be either <code>REAL</code> and a magnitude that is
+less than or equal to one - or be <code>COMPLEX</code>.</td></tr>
+</table>
+
+</dd>
+<dt><em>Return value</em>:</dt>
+<dd><p>The return value is of the same type and kind as <var>X</var>.
+The real part of the result is in radians and lies in the range
+<em>-\pi/2 \leq \Re \asin(x) \leq \pi/2</em>.
+</p>
+</dd>
+<dt><em>Example</em>:</dt>
+<dd><div class="smallexample">
+<pre class="smallexample">program test_asin
+  real(8) :: x = 0.866_8
+  x = asin(x)
+end program test_asin
+</pre></div>
+
+</dd>
+<dt><em>Specific names</em>:</dt>
+<dd><table>
+<thead><tr><th width="20%">Name</th><th width="23%">Argument</th><th width="20%">Return type</th><th width="33%">Standard</th></tr></thead>
+<tr><td width="20%"><code>ASIN(X)</code></td><td width="23%"><code>REAL(4) X</code></td><td width="20%"><code>REAL(4)</code></td><td width="33%">Fortran 77 and later</td></tr>
+<tr><td width="20%"><code>DASIN(X)</code></td><td width="23%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="33%">Fortran 77 and later</td></tr>
+</table>
+
+</dd>
+<dt><em>See also</em>:</dt>
+<dd><p>Inverse function: <br>
+<a href="SIN.html#SIN">SIN</a> <br>
+Degrees function: <br>
+<a href="ASIND.html#ASIND">ASIND</a>
+</p></dd>
+</dl>
+
+
+
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