Прошу помочь: 1)sin 3П -cos 3П/2=
2) cos 0 -cos 3П + cos3.5П=
3)sin Пk + cos 2Пk ,k принадлежит Z
4)cos (2k +1)П/2  -sin * (4k+1)П/2,k принадлежит Z
5)tg П + cos П =
6) tg П + sin П=
7)tg 0 - tg 180=
8)cos П -tg 2П=
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