atan2
Syntax:
#include <cmath> double atan2( double y, double x );
The atan2() function computes the arc tangent of y/x, using the signs of the arguments to compute the quadrant of the return value. The returned values are in the range [-pi, pi]. Note the order of the arguments passed to this function.
Related Topics: acos, asin, atan, cos, cosh, sin, sinh, tan, tanh