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Question 5 (HPW 17.4, Problem 14, p. 753) Find the critical points of the functions. For each critical point, determine, by the second- derivative test,

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Question 5 (HPW 17.4, Problem 14, p. 753) Find the critical points of the functions. For each critical point, determine, by the second- derivative test, whether it corresponds to a relative maximum, to a relative minimum, or to neither, or whether the test gives no information. f (x, y) = x2 + y2 - xy+x3

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