|x||The angle (in radians) to return the inverse sine of.|
Returns the inverse sine of x, in that if sin(x)=n, arcsin(n)=x,
and the resulting number will be between -pi/2 and pi/2.
NOTE: This will only accept a value between -1 and 1 (anything else will throw an error).
val = arcsin( 0 );
This will set val to 0.