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Atn2 – Arc tangent of Y/X

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' arc tangent of Y/X - returns values in all four quadrantsFunction Atn2(x As Double, y As Double) As Double    If x = 0 Then        Atn2 = Sgn(y) * 1.5707963267949    ElseIf x > 0 Then        Atn2 = Atn(y / x)    Else        Atn2 = Atn(y / x) + 3.14159265358979 * Sgn(y)    End IfEnd Function

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