ARCSINE

THE BOX'S MAIN HELP:
This function returns a scalar 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 should be a scalar between [-1,1].

OUT (output):
This function returns a scalar 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.

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