Suppose z = f (x, y) has continuous partial derivatives. Let x = er cos , y = er sin
Chapter 2, Problem 11(choose chapter or problem)
Suppose z = f (x, y) has continuous partial derivatives. Let x = er cos , y = er sin . Show that then z x 2 + z y 2 = e2r $ z r 2 + z 2 % .
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