Consider the function f(x, y) = 4 + 6x2 + y2 , which is differentiable in a environment D from point P = (−1, 1). The value of the directional derivative of f at P in the direction of the vector u = (4, 3) corresponds to: Answers: A)−48/5 B)−42/5 C)6/5 D)−54/5

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