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if u= tan^-1(y^2/x) , show that x^2 d^2u/dx^2 + y^2d^2u/dy^2 +2xy d^2u/dxy^

if u= tan^-1(y^2/x) , show that x^2 d^2u/dx^2 + y^2d^2u/dy^2 +2xy d^2u/dxy^2 =-sin2usin^2u

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