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det[{{(x^2-1)y/e^((x^2+y^2)/2),x(y^2-1)/e^((x^2+y^2)/2)},{(x^2-1)(y^2-1)/e^((x^2+y^2)/2),xy(y^2-3)/e^((x^2+y^2)/2)}}]
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