1) sin^2 П\8+ cos^2 3П\8+sin^2 5П\8+ cos^2 7П\8 2) tg 435+tg375
3) tg 225-tg 195
4) Ctg (13П/12)-ctg(5П/12)
5) sin (2x+5П\4) при tg x=2\3
6) cos (2x+7П\4) при ctg x=2\3
7) sin2x при sinx-cosx=p
Баллов не жалко,но вот решите пожалуйстаа
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