ATAN2 - arctan function.

(ANSI Standard)

Usage:

#include <math.h>
z = atan2( y, x );

Where:

double x, y, z;

 

Description:

"atan2" returns the arctan of "y/x" (in the range -pi to pi). If both arguments are zero, "atan2" sets "errno" to EDOM and returns a zero.

See Also:

expl c lib errno

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