ARCCOSINE

THE BOX'S MAIN HELP:

This function returns a scalar between [0,PI], the arccosine of A.
Arccosine is the inverse of the cosine function where the
acos(x) = y if and only if cos(y) = x.

A (input):

This must be a scalar between [-1,1].

OUT (output):

This function returns a scalar between [0,PI], the arccosine of A.
Arccosine is the inverse of the cosine function where the
acos(x) = y if and only if cos(y) = x.

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