3.[12]. For each of the following, evaluate the limit if it exists. If it does not exist, explain why. If the limit is infinite, determine whether it is co or -co. x3 - 2x2 x+1 (i) lim x-2x2 - x-2 (ii) lim X--3-x2(x +3) Vx2 + 5 - 3 (iii) sin (x - 3) lim (iv) lim x-2 x2 - 2x X-3x2 - 2x - 3