atan2(Decimal, Decimal)
Returns the angle, in radians, between the positive x-axis and the (x, y) point defined in
the two arguments. The angle is positive for counter-clockwise angles (upper half-plane, y >
0), and negative for clockwise angles
Decimal
arguments are rounded to double precision before function
application.
Examples: atan(1, 0)
= 1.5707963267948966
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