Simplified Common Lisp reference

Symbol class: Mathematics, Arithmetics, Logic and Comparisons

Syntax:

Symbol type: function

cosnumber => numeric value

Argument description:

number

numeric value, angle in radians

COS function computes cosine of value in radians.

(cos 0.0) => 1.0
(cos 1.0) => 0.5403023
(cos 1.0d0) => 0.5403023058681398d0
(cos #c(1.0 1.0)) => #C(0.83373 -0.9888977)