Question 2 In each of the following, a function f, a point P, and a vector are given. Calculate the gradient of f at the point, and the directional derivative at the point P, in the direction of the given vector . u a) f(x, y, z) =, P = (2, 1, 1), A = + 2 22 b) f(x, y, z) = x sin(y) + y cos(x), P = (0, ), A= 3+4 c) f(x, y, z) = ln(2x + 3y), P = (-1, 1), A = 4 3