The ASIN function returns the angle, expressed in radians, whose sine is X (i.e., the arc-sine). The range of ASIN is between - p /2 and p /2. Rules for the type and structure of the result are the same as those given for the ACOS function.
Result = ASIN( X )
The sine of the desired angle, -1 <= X <= 1.
To print the arc-sine of 0.707, enter:
PRINT, ASIN(0.707)
IDL prints:
0.785247
SIN
