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C++ Programming/Code/Standard C Library/Functions/atan2
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atan2
#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.
Related topics acos - asin - atan - cos - cosh - sin - sinh - tan - tanh