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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.45 cis | Function
  Syntax: cis radians number Arguments and Values: radians - a real. number - a complex. Description: cis returns the value of ei· radians, which is a complex in which the real part is equal to the cosine of radians, and the imaginary part is equal to the sine of radians. Examples:
       (cis 0)  #C(1.0 0.0)
See Also: Section 12.1.3.3 Rule of Float Substitutability Allegro CL Implementation Details: None.

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