4. Solve the integration * (2 points) S 45 sin(7x) sin(2x) dx = sin(5x) 10 + sin(9x) 18 +C 9 sin(5x) 2 - 5 sin(9x) 2 +c sin(5x) 5 sin(9x) 9 + С sin(5x). 10 sin(9x) 18 +C