ARCSINE
THE BOX'S MAIN HELP:
This function returns a float between [-PI/2,PI/2], the arcsine of A. Arcsine is the inverse of the sine function where the asin(x) = y if and only if sin(y) = x.
A (input):
This must be a float between [-1,1].
OUT (output):
This function returns a float between [-PI/2,PI/2], the arcsine of A. Arcsine is the inverse of the sine function where the asin(x) = y if and only if sin(y) = x.