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NAME    [Toc]    [Back]

       atan - arc tangent function

SYNOPSIS    [Toc]    [Back]

       #include <math.h>

       double atan(double x);

DESCRIPTION    [Toc]    [Back]

       The  atan() function calculates the arc tangent of x; that is the value
       whose tangent is x.

RETURN VALUE    [Toc]    [Back]

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

CONFORMING TO    [Toc]    [Back]

       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO    [Toc]    [Back]

       acos(3), asin(3), atan2(3), cos(3), sin(3), tan(3)

				  1993-06-08			       ATAN(3)
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