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12.2.45 cis [Function]

cis radians => number

Arguments and Values::

radians—a real.

number—a complex.

Description::

cis returns the value of~e^i\cdot 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::

Rule of Float Substitutability