Need help with #12 and 20

9-93 Evaluate the integral. COS X 9. dx 1 - sin x 10. ( 3x + 1) V2 dx arcsin x 11. [* Vy Inydy 12. dx V1 - x2 In(In y) X 13 . dy y 14. Jo (2x + 1)3 -dx X 15. dx x 4+ 9 16. t sin t cos t dt x + 2 cos(1/ x) 17. 4 dx 18. dx x2 + 3x - 4 1 19. dx 20. 2x - 3 dx x' Vx2 - 1 x3 + 3x COs x 21. dx 22. In(1 + x2 ) dx CSC X x 2 23. x sec x tan x dx 24. (V2/2 dx V1 - x2 levi 25. " t cost dt 26. dt tedx 28. 1 + pra dx 29. arctan Vx dx In x 30. dx xVI + (Inx)2 31 . S' ( 1 + Vx ) 'dx 32. (1 + tan x)2 sec x dx