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acos		function

Syntax:
radianAngle = acos( expr )

Description:
Returns the arccosine of expr in radians. In other words, if expr represents the cosine of some angle, then acos( expr ) returns the angle. The returned angle will be in the range of 0 to pi. acos returns a double-precision result.

See Also:
sin; cos; tan; atn; asin