Exercise II (4 x 5 = 20 points) Let 11131 + 1 cc+z2' \"331952) = 1. Find the domain of f. There is no need to sketch it, just describe it. 2. Compute the gradient of f. ' 3. Compute the directional derivative of f at (0, 1, 2) in the direction of the vector (1, 2, 2). 4. Find the maximum value of Ba: f (2, 1, 1) and for which 11' it is attained