12. Letf(x,y) = x3 - 6xy + y3. a) Determine that critical points of f(x,y). b) Use the second derivative test to classif
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12. Letf(x,y) = x3 - 6xy + y3. a) Determine that critical points of f(x,y). b) Use the second derivative test to classif
12. Letf(x,y) = x3 - 6xy + y3. a) Determine that critical points of f(x,y). b) Use the second derivative test to classify each critical point. c) If either a minimum or a maximum (or both) exists, state their value.
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