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A Tan 2 Function
Math Trig Complex Class

Public Function ATan2( _
      ByVal vX As Variant _
    , ByVal vY As Variant _
    ) As Variant

Angle of the point (X, Y) where X and Y are real numbers.
The point is expressed in rectangular coordinates.
Function returns an angle in radians that is between -Pi/2 and Pi/2.

Examples: 
    ATan2( 0, -1) =  0
    ATan2(-1, -1) = -2.35619449019234
    ATan2(-1,  0) = -1.5707963267949
    ATan2(-1,  1) = -0.785398163397448
    ATan2( 0,  1) =  0
    ATan2( 1,  1) =  0.785398163397448
    ATan2( 1,  0) =  1.5707963267949
    ATan2( 1, -1) =  2.35619449019234
See also: 
    ATan Function
    ACot2 Function
vX: The X-coordinate of the point whose angle from the origin is to be returned. Function returns Null if vX is Null or cannot be fixed up to a number.

vY: The Y-coordinate of the point whose angle from the origin is to be returned. Function returns Null if vY is Null or cannot be fixed up to a number.

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