The ASIN function returns a numeric value in radians that approximates the arcsine of argument-1. The type of this function is numeric.
Usage
FUNCTION ASIN (argument-1)
Parameters
1. Argument-1 must be class numeric.
2. 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 arcsine of argument-1 and is greater than or equal to -pi/2 and less than or equal to +pi/2.