Помогите, пожалуста:1. tg2x ctg2x =2. cosx - 1 =3. -

Помогите, пожалуста:
1. tg2x ctg2x =
2. cosx - 1 =
3. - sin2x - cos2x =
4. cos3x sin3x =
5. sinx/2 cosx/2 =
6. 1 - 2sin4x =
7. sin3x =
8. cosx cos5x + sinx sin5x =
9. cos6x sin8x - sin6x cos8x =
10. 1 + cos5x =
11. sin4x - sin8x =
12. cos3x + cos7x =
13. sin3x sin5x
14. cos (П/2-) =
15. tg (2П - ) =
16. sin12 + cos12 =
17. 2sin45 cos45 =
18. cos55/sin55 =
19. 2tg12 ctg12 =
20. cos26 - sin26 =
21. sin35 - cos35 =
22. 2cos26 - 1 =
23. - 2sin57 =
24. cos 25 cos35 - sin25 sin35 =
25. sin49 cos4 - cos49 sin4 =
26. sin15 + sin25 =
27. cos46 - cos22 =
28. sin35 cos35 =
29. sin36 cos36 =
30. 1 - cos68 =
Помогите!)