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Returns the angle (in radians) from the X axis to a point (y,x).
The atan2 method syntax has these parts:
Part Description Math Required. Invokes the intrinsic Math object. x Required. A numeric expression representing the cartesian x-coordinate. y Required. A numeric expression representing the cartesian y-coordinate.
The return value is between -pi and pi, representing the angle of the supplied (y,x) point.
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