1. 5π4, 7π4
3. π3, 5π3
5. π2
7. π2, 3π2
9. π4+2πk, 7π4+2πk, where k is an integer
11. 7π6+2πk, 11π6+2πk, where k is an integer
13. π18+2π3k, 5π18+2π3k, where k is an integer
15. 5π12+2π3k, 7π12+2π3k, where k is an integer
17. π6+πk, 5π6+πk, where k is an integer
19. π4+2π3k, 5π12+2π3k, where k is an integer
21. 4+8k, where k is an integer
23. 16+2k, 56+2k, where k is an integer
25. 0.2734, 2.8682
27. 3.7603, 5.6645
29. 2.1532, 4.1300
31. 0.7813, 5.5019
33. 0.04829, 0.47531
35. 0.7381, 1.3563
37. 0.9291, 3.0709
39. 1.3077, 4.6923