ARCTANGENT

THE BOX'S MAIN HELP:

This fucntion returns a scalar between [-PI/2,PI/2], 
the arctangent of A.  Arctangent is the inverse of the tangent 
function where the atan(x) = y if and only if tan(y) = x.

A (input):

This may be any real number.

OUT (output):

This fucntion returns a scalar between [-PI/2,PI/2], 
the arctangent of A.  Arctangent is the inverse of the tangent 
function where the atan(x) = y if and only if tan(y) = x.

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