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(d^2/dy^2 (x^2ye^(-x^2-y^2))) + (d^2/dx^2 (x^2ye^(-x^2-y^2)))
(d^2/dy^2 (x^2ye^(-x^2-y^2))) + (d^2/dx^2 (x^2ye^(-x^2-y^2)))
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