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function ArcTan(X: Float): Float

Calculates the arctangent of the given number. Calculate other trigonometric functions using Sin, Cos, and ArcTan in the following expressions:

Tan(x) = Sin(x) / Cos(x)

ArcSin(x) = ArcTan(x/sqrt (1-sqr (x)))

ArcCos(x) = ArcTan(sqrt (1-sqr (x)) /x)