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Compute the directional derivative of the following function at the given point P in the direction of the given vector. Be sure to use a unit vector for the direction vector. f(x,y) = In (9+2x2+2y?); P(3, - 3); (2,3) Find the gradient of f(x.y) = In (9+2x2+2y?) Vf(xy) = D The directional derivative is (Type an exact answer, using radicals as needed.)