ASin
Calculates the arcsine, or inverse sine, of a number. The angle is expressed in radians, in an interval from -pi/2 to +pi/2.
Syntax
ASin(number)ArcSin(number)
number = number whose arcsine you want to retrieve, must be between -1 and +1
Remarks
If number is outside the interval from -1 to +1, the function will return a zero.
If you want a result expressed in degrees, you can multiply it by 180/pi or use the Degrees function.
Example
ASin(0) = 0Degrees(ASin(-0.5)) = -30