Question: Let (x, y) = g(u), where u = x 2 + y 2 and g(u) is differentiable. Prove that 2 (1) + ( ) =

Let ƒ(x, y) = g(u), where u = x2 + y2 and g(u) is differentiable. Prove that

2 (1) + ( ) = 4u 2 N (dg) du

2 (1) + ( ) = 4u 2 N (dg) du

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