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atan2, atan2f, atan2l - arc tangent function
of two variables
#include <math.h>
double atan2(double y, double x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);
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.
The atan2() function returns the result in radians,
which is between -PI and PI (inclusive).
SVID 3, POSIX, BSD
4.3, ISO 9899. The float and long double variants are C99 requirements.
acos(3)
, asin(3)
, atan(3)
, cos(3)
, sin(3)
, tan(3)
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