Maths by Mr. M. P. Keshari
Exercise - 25
Evaluate the following:
1. 
2. Sec 500 Sin 400 + Cos 400 Cosec 500
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. tan 350 tan 400 tan 450 tan 500 tan 550
11. tan 70 tan 230 tan 600 tan 670 tan 830
12. tan 50 tan 250 tan 300 tan 650 tan 850
13. 
14. 
15. 
16. 
17. 
18. 
19. Express sin 810 + tan 710 in terms of trigonometric ratios of angles between 00 and 450.
20. Express cos 750 + cot 750 in terms of trigonometric ratios of angles between 00 and 450.
21. If 
where 
are acute angles, find the value of 
22. If A and B are acute angles and sin A = cos B, Prove that A + B = 900.
23. If A, B, C are the interior angles of a triangle ABC, show that show that 
24. 
25. 
26. 
Answers
| 1. 0 | 2. 2 | 3. 2 | 4. 0 |
| 5. 0 | 6. 0 | 7.1/2 | 8. 1 |
| 9. 1 | 10. 1 | 11.  |
12.  |
| 13. 0 | 14. 2 | 15. 1 | 16. 2 |
| 17. 2 | 18. 2 | 19. cos 90 + cot 190 | 20. sin 15 0 + tan 15 0 |
| 21. 280 |
| Subjects | Maths (Part-1) by Mr. M. P. Keshari |
| Chapter 9 | Circle |
| Chapter 10 | Tangents to a circle |
| Chapter 11 | Geometrical Construction |
| Chapter 12 | Troigonometry |
| Chapter 13 | Height and Distance |
| Chapter 14 | Mensuration |
| Chapter 15 | Statistics |
| Chapter 16 | Probability |
| Chapter 17 | Co-ordinate Geometry |