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If u(x,y) = (x^2 + y^2)/√(x + y), prove that x(∂u/∂x) + y(∂u/∂y) = (3/2)u

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If u(x,y) = (x2 + y2)/√(x + y), prove that x(∂u/∂x) + y(∂u/∂y) = (3/2)u 

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u(x,y) = (x2 + y2)/√(x + y)

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