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tan
Format: tan( x )
Arguments: (num) x Angle in radians, may be any
real or complex number
Returns: (num) The tangent of angle x
Examples: tan(1) = 1.557
tan(45deg) = 1
tan(1+I) = 0.272+1.084i
See Also: sin, cos, asin,
acos, atan, atan2, PI
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