Question: 4. (15 marks) Let f(x, y) = x3 + xy+ y? for x 2 1 and all real y. Find and classify all critical points

4. (15 marks) Let f(x, y) = x3 + xy+ y?

for x 2 1 and all real y. Find and classify all

4. (15 marks) Let f(x, y) = x3 + xy+ y? for x 2 1 and all real y. Find and classify all critical points of f

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