to the lines Li(t) = (t + 1,2t - 1, -f + 2) and D2(s) = (-2s + 5, -3, s + 1) 3. (6 points) Let f (x, y) = 12 + 12 Evaluate the limit |lim / (r, y) or determine that it (21)-(0,0) does not exist