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acos 

 <TITLE>acos</TITLE>
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<h3>ACOS(3)             Linux Programmer's Manual             ACOS(3)
</h3>

<h3>NAME
</h3>       acos - arc cosine function

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

       double acos(double x);

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

<h3>RETURN VALUE
</h3>       The  acos() function returns the arc cosine in radians and
       the value is mathematically defined to be between 0 and PI
       (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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<h3>SEE ALSO
</h3><p>
<a href=asin.htm>asin</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>, 
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                           June 8, 1993                         1



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