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atan2 (clj)
(source)function
(atan2 y x)
Returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta).
Computes the phase theta by computing an arc tangent of y/x in the range of -pi to pi.
For more details on special cases, see:
https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#atan2-double-double-