Syntax: @COS(X)
X = a numeric value expressed in radians.
@COS returns the cosine of angle X. The result is between -1 and 1. (To convert the argument from degrees to radians, use the @RADIANS function.)
Examples:
@COS(-45) = 0.52532199
@COS(K24) = 0.5403023, where K24 = 1
@COS(@RADIANS(30)) = 0.866025