Compute the discriminant D(x, y) of the function. f(x, y) = x³ + y4 - 6x-2y2² +4 (Express numbers in exact form. Use symbolic notation and fractions where needed.) D(x, y) = Which of these points are saddle points? (-√2,-1) (-√2,0) (√2,0) □ (√2,1) □ (√2,-1) □ (-√2,1)

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