9. Determine the value of the following integrals. (a) (5 points) + 2x + 2 dr = 0 (b) (5 points) sin r dir = -1/2 (c) (5 points) cos(ar) . sin(xx) dx = 1/4 In (2) (d) (5 points) res dir = 312/2 5 (e) (5 points) dr = o V9 - +2 (f) (5 points) sin (x) de = 7 /2 (g) (5 points) sin (x) cos* (x) dr o