7. 6 7 6 6 5 6 3 2 3 3 6 3 6 x x x 2 x 3 x 6 x 3 ln 1 x 6arctg x 7 5 2 x 2 1 1 2 8. 2 arctg 1 x 9. x 1 ln xx 1 2 2 2 x 3 10. x 9 1. 2. 3. +C 153