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7. Suppose that f(x, y) = x2 + y2. 5 = (3, 4) (a) Find the gradient Vf and and the vector u = (b)

7. Suppose that f(x, y) = x2 + y2. 5 = (3, 4) (a) Find the gradient Vf and and the vector u = (b) Find the directional derivative of f at (1, 1) on the direction of U

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