Compute a complex number based on its polar coordinates
The function \(FromPolar\) computes a complex number from the polar coordinates of a point in the coordinate system.
Since there are multiple representations of a point at a complex level, the function's return value is normalized to a positive number, and the angle is normalized to a value in the range of \(-Pi\) to \(Pi\). As a result, the values of the angle and magnitude correspond to the resulting complex number may not match the original values of the angle parameter.
FromPolar (magnitude, angle)
FromPolar(6.4,51.31)= 4+5i
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