4. Find (a) the gradient of f at P and (b) the rate of change of the function value in the direction of U at P. (a) f(x, y) = 2² – 4y; U = cos r î + sin r î; P(-2,2) osm î + sin }a î; P(-2,2) %3D = COS (b) f(r, y) = e2rv; U = i-; P(2,1)

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