1. cos 57 ° = 0.544639035
3. cos 15 ° = cos12(30 ° ) = 1 + cos 30 ° 2−−−−−−−−−−−√ = 1.86602−−−−−−√ = 0.9659
5.
sin 105 ° = sin12(210 ° ) = 1 − cos 210 ° 2−−−−−−−−−−−−√ = 1.86602−−−−−−√ = 0.9659
7. cos3π8 = cos12(3π4) = 1 + cos3π42−−−−−−−−−⎷ = 0.292892−−−−−−−√ = 0.3827
9. sin 118 ° = 0.8829476
11. cos 48 ° = 0.6691
13. ± sin 4x
15. ± cos 3x
17. ± 22–√ sin 5θ
19. 1
21. 12626−−√
23. 0.1414
25. ± 2 sec αsec α − 1−−−−−−−−√
27. tan12α = 1 − cos αsin α = sin α1 + cos α
29. 1 − cos α2 sin12α = 1 − cos α212(1 − cos α)−−−−−−−−−−−√ = 1 − cos α2−−−−−−−−−√
31. 22 (1 + cos x)(1 + cos x)2(2)(1 + cos x)−−−−−−−−−−−−−−−−−−−−√ = 2(1 + cos x)2 ∙ 21 + cos x−−−−−−−−√
33.
35.
37. ± 247
39. 3 − 22–√−−−−−−−√
41. 155–√
43. 4 sinθ2
45.
sin ωt = ± 1 − cos 2ωt2−−−−−−−−−−√ , sin2 ωt = 12(1 − cos 2ωt)
47. 1 − cos(A + ϕ)2−−−−−−−−−−−−−√1 − cos A2−−−−−−−−−√ = 1 − cos(A + ϕ)1 − cos A−−−−−−−−−−−−−√
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