Найдите значение выражения:
1) cos(2p-p/6)-sin(-p/3)+ctg p/2
2) 2cos(-p/4) +tg(2p-p/4)-2sin 2p
3) 4sin(-p/4)+2cos(6p-p/3)-2cos 3p/2
4) sin p/6 - cos(-6p) - 0,5crg(-p/4)
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