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RedHat 9 (Linux i386) - man page for atan2 (redhat section 3)

ATAN2(3)			    Linux Programmer's Manual				 ATAN2(3)

NAME
       atan2 - arc tangent function of two variables

SYNOPSIS
       #include <math.h>

       double atan2(double y, double x);

DESCRIPTION
       The atan2() function calculates the arc tangent of the two variables x and y.  It is simi-
       lar to calculating the arc tangent of y / x, except that the signs of both  arguments  are
       used to determine the quadrant of the result.

RETURN VALUE
       The  atan2()  function  returns the result in radians, which is between -PI and PI (inclu-
       sive).

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       acos(3), asin(3), atan(3), cos(3), sin(3), tan(3)

					    1993-06-08					 ATAN2(3)


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