Mathematics For Class X Science - Unit 15: TRIGONOMETRY- Fill In The Blanks And Multiple Choice Questions (MCQs)

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UNIT 15: TRIGONOMETRY
Fill In The Blanks And Multiple Choice Questions (MCQs)

Fill In The Blanks

12. Sin 20° = sin (90° - 70°) = cos 70°.
13. Cos 10° = cos (90° - 80°) = sin 80°.
14. Tan 40° = tan (90° - 50°) = cot 50°.
15. Sec 80° = (90° - 10°) = cosec 10°.
16. Cosec 10° = sec 80°.
17. Tan 20° = cot 70°.
18. 1 + tan² θ = sec² θ.
19. Cosec 60° = (90° - 30°) = sec 30°.
20. Cos 20° = sin 70°.
21. Cos 80° = sin 10°.
22. Tan² θ + 1 = sec² θ.
23. Sin 30° = cos 60°.
24. 1 + tan² 45° = sec² 45°.
25. Sin θ . sec θ = tan θ.
26. Cosec 30° = 2.
Special thanks to Sir Sajjad Akber Chandio