Let z = f (x, y), where f has continuous partial derivatives. If we make the standard
Chapter 2, Problem 30(choose chapter or problem)
Let z = f (x, y), where f has continuous partial derivatives. If we make the standard polar/rectangular substitution x = r cos , y = r sin , show that z x 2 + z y 2 = z r 2 + 1 r 2 z 2 .
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