Consider the following. ) = \, P(7, 1), u = i + j y 5 (a) Find the gradient of f. f(x, y) Vf(x, y) = (b) Evaluate the gradient at the point P. Vf(7, 1) = (c) Find the rate of change of f at P in the direction of the vector u. Duf(7, 1) = =

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