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MathGroup Archive 1998

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problems with integral



Hi!!!
I'm trying to solve the following integral using Mathematica 3.0, but 
Mathematica don't give any answer, the integral is: Integrate[
    Sqrt[
        ((x y - x^2 y - x y^2 + x^2 y^2 - z^2)/
          (x^2 y^2 - 2 x^3 y^2 + x^4 y^2 - 2 x^2 y^3 +
              4 x^3 y^3 - 2 x^4 y^3 + x^2 y^4 - 2 x^3 y^4 +
              x^4 y^4 + x y z - 3 x^2 y z + 2 x^3 y z -
              3 x y^2 z + 9 x^2 y^2 z - 6 x^3 y^2 z +
              2 x y^3 z - 6 x^2 y^3 z + 4 x^3 y^3 z - x z^2 +
              x^2 z^2 - y z^2 + 6 x y z^2 - 6 x^2 y z^2 +
              y^2 z^2 - 6 x y^2 z^2 + 6 x^2 y^2 z^2 + z^3 -
              2 x z^3 - 2 y z^3 + 4 x y z^3 + z^4))], x] I wanna solve
it analitically (if it is posible). Thanks in advance. Best regards,
Jose M. <jose.m.ramon@uv.es>   



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