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atan
Format: atan( x )
Arguments: (num) x Any real or complex number
Returns: (num) The arc tangent of x in radians
Description: The arc tangent of x is defined as
the angle (in radians) whose tangent is x.
Examples: atan(-0.5) = -0.464
atan(1)/deg = 45 (degrees)
atan(1+I) = 1.017+0.402i
tan(atan(10)) = 10
See Also: atan2, asin, acos, sin, cos,
tan, PI
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