1.

Let f(l3, y) = 50242432 . (a). Find the gradient of f at the point Where (1:, y) = (1,2). (b). Find the directional derivative of f at the point where (3:, y) = (1,2) in the direction of the vector . Let f(w, y,z z): 9 232 y2 z2. (a). Find the gradient of f at the point Where (11:, y,z z): (0, 1, 2). (b). Find the directional derivative of f at the point (11:,y, z) = (0,1,2) in the direction of the vector