Find the gradient ?f.f(x, y) = -3xy2 + 6x2y
A. x(-3y + 12x)i + y(6x - 6y)j
B. y(6y - 6x)i + x(-3x + 12y)j
C. x(6x - 6y)i + y(-3y + 12x)j
D. y(-3y + 12x)i + x(6x - 6y)j
Answer: D
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