cis | Function |

**Syntax****cis**radians → number**Arguments and Values**`radians`— a*real*.`number`— a*complex*.**Description****cis**returns the value of ↓*e*^{i· ↓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**