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(Solved): 8. Let f(x, y) = x + y - 3xy. (a) Does f have a local maximum or a local minimum at (0,0)? (b) ...
8. Let f(x, y) = x³ + y³ - 3xy. (a) Does f have a local maximum or a local minimum at (0,0)? (b) Does f have a local maximum or a local minimum at (1,1)?