The COS function returns a numeric value that approximates the cosine of an angle or arc, expressed in radians that is specified by argument-1. The type of this function is numeric.
FUNCTION COS (argument-1)
| argument-1 | Must be class numeric. |
The returned value is the approximation of the cosine of argument-1 and is greater than or equal to -1 and less than or equal to +1.