(b) 2 sin cos 2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 60E
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30 B
19. cos 165°
20. cos 112.5°
T
21. tan
8.
22. cos
8
T
23. сos
12
24. tan
12
25. sin
8.
11T
26. sin
12
27–32 - Simplify the expression by using a double-angle
formula or a half-angle formula.
27. (a) 2 sin 18° cos 18°
(b) 2 sin 30 cos 30
2 tan 7°
2 tan 70
28. (а)
1 – tan? 7°
(b)
1 - tan? 70
29. (a) cos? 34° – sin² 34°
(b) cos 50
sin? 50
30. (a) cos?
sin?
(b) 2 sin
cos
2
sin 8°
31. (а)
(b)
cos 40
1 + cos 8°
sin 40
32. (а)
- cos 30°
1- cos 80
(b)
Transcribed Image Text:19. cos 165° 20. cos 112.5° T 21. tan 8. 22. cos 8 T 23. сos 12 24. tan 12 25. sin 8. 11T 26. sin 12 27–32 - Simplify the expression by using a double-angle formula or a half-angle formula. 27. (a) 2 sin 18° cos 18° (b) 2 sin 30 cos 30 2 tan 7° 2 tan 70 28. (а) 1 – tan? 7° (b) 1 - tan? 70 29. (a) cos? 34° – sin² 34° (b) cos 50 sin? 50 30. (a) cos? sin? (b) 2 sin cos 2 sin 8° 31. (а) (b) cos 40 1 + cos 8° sin 40 32. (а) - cos 30° 1- cos 80 (b)
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