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Find all critical points of f(x,y) = 2x3y -4x3 + 6y3 -18y +19 (0, 1) , (0, - 1) and (- 3, 2) only (

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Find all critical points of f(x,y) = 2x3y -4x3 + 6y3 -18y +19 (0, 1) , (0, - 1) and (- 3, 2) only ( 3, 2) only ( -3 , 2) (0, 1) , (0, - 1) and (- 9 , 2) O only (0 , 1) and (- 3 , 2)

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