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 similar 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 (inclusive).
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
acos(3) asin(3) atan(3) cos(3) sin(3) tan(3)