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1. In each case find the partial derivatives of f. (a) f(x, y) = x log(xy), D = { (x, y) : xy > 0}.

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1. In each case find the partial derivatives of f. (a) f(x, y) = x log(xy), D = { (x, y) : xy > 0}. (b) f (x, y, z) = (x2 + 2y2 + 2)3. (c) f (x) = X . X

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