5 Integrate the rational functions in Exercises 1 to 21. 1. ( 1) ( 2) x x x 2. 2 1 x 9 3. 3 1 ( 1) ( 2) ( 3) x x x x 4. ( 1) ( 2) ( 3) x x x x 5. 2 2 3 2 x x x 6. 2 1 (1 2 ) x x x 7. 2 ( 1)( 1) x x x 8. 2 ( 1) ( 2) x x x 9. 3 2 3 5 1 x x x x 10. 2 2 3 ( 1) (2 3) x x x 11. 2 5 ( 1) ( 4) x x x 12. 3 2 1 1 x x x 13. 2 2 (1 ) (1 ) x x 14. 2 3 1 ( 2) x x 15. 4 1 x 1 16. 1 ( 1) n x x [Hint: multiply numerator and denominator by x n 1 and put x n = t ] 17. cos (1 sin ) (2 sin ) x x x [Hint : Put sin x = 18. 2 2 2 2 ( 1)( 2) ( 3) ( 4) x x x x 19. 2 2 2 ( 1)( 3) x x x 2
5 Integrate the rational functions in Exercises 1 to 21
Question 1:( 1) ( 2) x x x
Question 2:2 1 x – 9
Question 3:3 1 ( 1) ( 2) ( 3) x – x – x– x–
Question 4:( 1) ( 2) ( 3) x x – x– x–
Question 5:2 2 3 2 x x x
Question 6:2 1 (1 2 ) – x x – x
Question 7:2 ( 1)( – 1) x x x
Question 8:2 ( 1) ( 2) x x– x
Question 9:3 2 3 5 1 x x –x x
Question 10:2 2 3 ( 1) (2 3) x x– x
Question 11:2 5 ( 1) ( 4) x x x
Question 12:3 2 1 1 x x x
Question 13:2 2 (1 ) (1 ) x x
Question 14:2 3 1 ( 2) x – x
Question 15:4 1 x 1
Question 16:1 ( 1) n x x [Hint: multiply numerator and denominator by x n – 1 and put x n = t ]
Question 17:cos (1 – sin ) (2 – sin ) x x x [Hint : Put sin x =
Question 18:2 2 2 2 ( 1)( 2) ( 3) ( 4) x x x x
Question 19:2 2 2 ( 1)( 3) x x x
Question 20:4 1 x ( 1 x – )
Question 21:1 ( 1) x e – [Hint : Put e x = t] Choose the correct answer in each of the Exercises 22 and 23
Question 22:( 1) ( 2) x dx x x equals (A) 2 ( 1) log C 2 x x (B) 2 ( 2) log C 1 x x (C) 2 1 log C 2 x x (D) log ( 1) ( 2) C x x
Question 23:2 ( 1) dx x x equals (A) 1 2 log log ( +1) + C 2 x x (B) 1 2 log log ( +1) + C 2 x x (C) 1 2 log log ( +1) + C 2 x x (D) 1 2 log log ( +1)