1) int (3 * cos x + 5) dx = 3 * sin x + 5 * x + C
2) int (2 * x + 1)/(x + 1)^2 dx = int (2 * x + 2 - 1)/(x + 1)^2 dx =
= int (2 * x + 2)/(x + 1)^2 dx - int dx/(x + 1)^2 =
= int 2/(x + 1) dx - int (x + 1)^(-2) dx =
= 2 * ln |x + 1| - 1/(-2 + 1) * (x + 1)^(-2 + 1) + C =
= 2 * ln |x + 1| + 1/(x + 1) + C