The ACOS function returns a numeric value in radians that approximates the arccosine of argument-1. The type of this function is numeric.
Usage
FUNCTION ACOS (argument-1)
Parameters
Argument-1 must be class numeric.
The value of argument-1 must be greater than or equal to -1 and less than or equal to +1.
Returned Values
The returned value is the approximation of the arccosine of argument-1 and is greater than or equal to zero and less than or equal to pi.