ASINE() returns the numeric arc sine of an angle that is expressed in radians.
ASINE(radians)
ASINE() returns the numeric arc sine of the measurement of the desired angle in radians.
Note: If your angle is expressed in degrees, use the RADIAN() function to convert the degrees to radians. To round the result of the RADIAN() function, use the DECIMALS() function.
ASINE(.7854) = 0.903342077863495
ASINE(DECIMALS(RADIANS(45),4))= 0.903342077863495