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

<h3>NAME
</h3>       atan - arc tangent function

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

       double atan(double x);

<h3>DESCRIPTION
</h3>       The  atan() function calculates the arc tangent of x; that
       is the value whose tangent is x.

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

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

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<h3>SEE ALSO
</h3><p>
<a href=acos.htm>acos</a>, 
<a href=asin.htm>asin</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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