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====== Function CIS ====== ====Syntax==== * **cis** //radians// → //number// ====Arguments and Values==== * //radians// - a //[[CL:Glossary:real]]//. * //number// - a //[[CL:Glossary:complex]]//. ====Description==== **cis** returns the value of ''e<sub>i * //radians//</sub>'', which is a //[[CL:Glossary: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==== <blockquote> (cis 0) <r>#C(1.0 0.0) </r> </blockquote> ====Side Effects==== None. ====Affected By==== None. ====Exceptional Situations==== None. ====See Also==== {\secref\FloatSubstitutability} ====Notes==== None.