f(x, y) = x2 + Sxy + y2 O f(8,0) = 64, local minimum; f(0, 8) = 64, local minimum f(0,0) = 0, saddle point; f(8, 8) = 640, local maximim f(0, 0) = 0, saddle point f(8, 8) = 640, local maximim

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