# Asin

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<h3>ASIN(3)             Linux Programmer's Manual             ASIN(3)
</h3>

<h3>NAME
</h3>       asin - arc sine function

<h3>SYNOPSIS
</h3>       #include &lt;math.h&gt;

double asin(double x);

<h3>DESCRIPTION
</h3>       The  asin() function calculates the arc sine of x; that is
the value whose sine is x.  If x falls outside  the  range
-1 to 1, asin() fails and errno is set.

<h3>RETURN VALUE
</h3>       The  asin()  function  returns the arc sine in radians and
the value is mathematically defined to  be  between  -PI/2
and PI/2 (inclusive).

<h3>ERRORS
</h3>       EDOM   x is out of range.

<h3>CONFORMING TO
</h3>       SVID 3, POSIX, BSD 4.3, ISO 9899

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<hr>
</h3><p>
<a href=acos.htm>acos</a>,
<a href=atan.htm>atan</a>,
<a href=atan2.htm>atan2</a>,
<a href=cos.htm>cos</a>,
<a href=sin.htm>sin</a>,
<a href=tan.htm>tan</a>,
<pre>

June 8, 1993                         1

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