Question: Use the Second Derivative Test (if necessary) to classify the critical points of z=f(x,y). If the test fails, classify the critical point by other means.

Use the Second Derivative Test (if necessary) to classify the critical points of z=f(x,y). If the test fails, classify the critical point by other means. Write your answer in the form (x,y,z). Separate multiple points with a comma. If a classification is not represented, select "None" for your answer.f(x,y)=2x^2+x2yy^2

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