ATAN2(3) Linux Programmer's Manual ATAN2(3)
NAME
atan2 - arc tangent function of two variablesSYNOPSIS
#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
acos, asin, atan, cos, sin, tan,
June 8, 1993 1
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