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d^2/dx^2 [xy (x^2-y^2)/(x^2+y^2)] + d^2/dy^2 [xy (x^2-y^2)/(x^2+y^2)]
d^2/dx^2 [xy (x^2-y^2)/(x^2+y^2)] + d^2/dy^2 [xy (x^2-y^2)/(x^2+y^2)]
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