Let (x, y) = g(u), where u = x 2 + y 2 and g(u) is differentiable.

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

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

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Calculus

ISBN: 9781319055844

4th Edition

Authors: Jon Rogawski, Colin Adams, Robert Franzosa

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