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From the manual page for atan2:
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);
float atan2f(float y, float x);
long double atan2l(long double y, long 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).
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);
float atan2f(float y, float x);
long double atan2l(long double y, long 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).
