<TITLE>atan</TITLE>
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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 <math.h>
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>,
<pre>
June 8, 1993 1
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