lispdoc - results for phase

(phase number)
Function: Return the angle part of the polar representation of a complex number. For complex numbers, this is (atan (imagpart number) (realpart number)). For non-complex positive numbers, this is 0. For non-complex negative numbers this is PI.
 Mentioned in:
CLtL2 - 12.5.1. Exponential and Logarithmic Functions
CLtL2 - 12.5.2. Trigonometric and Related Functions
CLtL2 - 12.5.3. Branch Cuts, Principal Values, and Boundary Conditions in the Complex Plane
HyperSpec - Function PHASE