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1. Find the critical points, relative extrema, and saddle points. Make a sketch indicating the level sets. (b) f (x, y) = (x + 1)(y

1. Find the critical points, relative extrema, and saddle points. Make a sketch indicating the level sets. (b) f (x, y) = (x + 1)(y - 2). (d) f (x, y) = xy(x - 1)

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