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u = tan^-1 (x^3 y^3 / x^3 + y^3) = x (∂u/∂x)+y(∂u/∂u)=3/2 sin2u

u = tan^-1 (x^3 y^3 / x^3 + y^3) = x (∂u/∂x)+y(∂u/∂u)=3/2 sin2u

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