Given f(x, y) = x³ – 2xy + 3y². Which of the following is true? fa = -æ + 6y + 3æy²; fy = 3x² – 2y + y fan = 6x; fzy = -2+ 3y² None of these f. = 3x² – 2y + y; fy = 6x %3D fzz = 6 + 6y; fyy = 6x

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