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f(x,y) = -(3xy^2 - 25y + 3x^3)/(3y^3 + 3x^2y - 25x) for (x,y)=(3,1)
f(x,y) = -(3xy^2 - 25y + 3x^3)/(3y^3 + 3x^2y - 25x) for (x,y)=(3,1)
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