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    Re: distance with atan2
    From: Herbert Prinz
    Date: 2005 Nov 12, 14:34 -0500

    George Huxtable wrote:
    > If a POL function is used to provide an angle output, as the A of a (R,A)
    > pair, is the resulting R of any value, or must it be discarded? That's a
    > similar question to what Bill has been asking.
    Probably you have read my previous post in the mean time and have thus
    found the answer yourself. The x and y in Paul's formula are really the
    cosine and sine of the same angle, namly of the required one between the
    two position vectors. Therefore A can be interpreted as the direction of
    a unit vector and R as its length. If your program does not spit out "1"
    for R each time you run it, you better call your bugcheck routine.
    Herbert Prinz

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