2. For the function z = f(x, y) is known f(2, -1) = -2, f.(2, –1) = -1, f,(2, –1) = 2. Find the following (a) Gradient of f at the point (2, -1) :grad f(2, -1) (b) Directional derivative of f at the point (2, –1) in the direction of the vector -27+37: fa(2, -1). (c) Estimate f(1.99, –1.02) =

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