Exercise 7.4

2/6 3/1 / x / x + 2. 2 1 4 x+ 3. ( ) 2/1 / 2 1- x + / 4. 2 / 9 25- x 5. 4 1 2 x x+ 6. 2/61 x x−

2 1/1 / x - / x - 8. 6 6 x x a+ 9. 2/2 sec tan 4 x x + 10. 2 2 2x x+ + 11. 2 9 6 5x x+ + 12. 2 7 6- x - x 13. ( )( ) 1 2x - x - 14. 2 8 3 x - x+ 15. ( )( ) x - a x - b 16. 2 4 1 2 3 x x x - + + 17. 2 2/1 x x - + 18. 2 5 2 1 2 3 x x x − + + 19. ( )( ) / 6 7 / 5 4 / x / x - x - + 20. 2 2/4 x x - x + 21. 2/2 2 3 x x x + + + 22. 2 2 5 x x - x + − 23. 2 5 3 4 10 x x x + + + . Choose the correct answer in Exercises 24 and 25. 24. 2 equals 2 2 dx x x+ +∫ (A) x tan-1 (x + 1) + C (B) tan-1 (x + 1) + C (C) (x + 1) tan -1 x + C (D) tan-1 x + C 25. 2 equals 9 4 dx x x−∫ (A) -11 9 8sin C9 8 x −  +   (B) -11 8 9sin C2 9 x −  +   (C) -11 9 8sin C3 8 x −  +   (D) -11 9 8sin C2 9 x −  +  