ArcTan( nNumber ) : number
Calculates the arctangent of a nNumber. You can also 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)
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