Find the gradient vector field Vf of f and sketch it. f(x, y) = x2 - 4y Vf(x, y) = y 6h y 6 94444 -6 4 2 94444 IL 94441 I +2 -6 6 6. 544414 L 94441 t 1 -6 y y -6 6 -6 72 6 +2 A N

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