atan2() and atan2f()

  #include <math.h>

  

  double atan2(double y, double x);

  

  float  atan2f(float y, float x);

  

atan2() computes the principal value of the arc tangent of y/x. It uses the sign of both operands to determine the quadrant of the result.

The arc tangent tan^(-1)(y/x), in the range from -Pi to Pi rad, if neither x or y are 0. If both x and y are 0, it returns 0.

acos() and acosf()

asin() and asinf()

atan() and atanf()

cos() and cosf()

sin() and sinf()

tan() and tanf()