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acos
Format: acos( x )
Arguments: (num) x Any real or complex number
Returns: (num) The arc cosine of x in radians
Description: The arc cosine of x is defined as
the angle (in radians) whose cosine is x.
Examples: acos(-1) = 3.142
acos(0.5)/deg = 60 (degrees)
acos(1+I) = 0.905-1.061i
cos(acos(10)) = 10
See Also: asin, atan, atan2, sin, cos,
tan, PI
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