Atan2
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Function Description
Returns the arctangent, or inverse tangent, 
, of
the specified x- and y-coordinates. The arctangent is the angle from the x-axis
to a line containing the origin (0, 0) and a point with coordinates 
,
Differs from MnAtan as the
latter returns an answer between 
and
so
does not differentiate between and
.
Note: the ordering of the input variables (first parameter: 
, second parameter: 
) is as per the ATAN2
function in Excel but the ATAN2 function in .NET has the parameter order
reversed.
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