9) sing
2 cos 2°
sin 88° + cos2°
10) sin+a+cosa +2sin’acos’a;
11) tgʻa (2cos'a+sin’a-1);
12) cos'a + tgʻa cosa ;
13) tgʻa-sinʼatgʻa;
14) (1-sina)(1+sina);
15) tg5°tg 25°tg45°tg65°tg85°.
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вопрос

9) 2cos(2°) = 2cos²(1°) = 2(1 - sin²(1°)) ≈ 1.9985

10) sin(a) + a + cos(a) + 2sin(a)cos(a) = sin(a) + cos(a) + sin(2a) = 2sin(1.5a)cos(0.5a) ≈ 1.99

11) tg(a)(2cos(a) + sin(a) - 1) = tg(a)(1 + sin(a)) ≈ 1.99

12) cos(a) + tg(a)cos(a) = cos(a) + sin(a) ≈ 1 + 1 = 2

13) tg(a) - sin(a)tg(a) = tg(a)(1 - sin(a)) ≈ 1.99

14) (1 - sin(a))(1 + sin(a)) = 1 - sin²(a) = cos²(a) ≈ 0.995

15) tg(5°)tg(25°)tg(45°)tg(65°)tg(85°) = 1 (since the product of tangents of consecutive complementary angles is always 1)