Let f(x, y) = 10-3r² +4. (a) Find the gradient Vƒ(2,-3) of f at the point P(2,−3). (b) Find the directional derivative D₁ƒ(2,-3) of ƒ in the direction of the vector =(,1). (c) Find the largest and smallest directional derivative of f at the point P, as well as the directions in which they occur.

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