Suppose f(x, y) = (x - y) (16 xy). Answer the following. Each answer should be a list of points (a, b, c) separated by commas, or, if there are no points, the answer should be NONE. 1. Find the local maxima of f. Answer: 2. Find the local minima of f. Answer: 3. Find the saddle points of f. Answer:

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