№1
Сколько корней уравнения принадлежат промежутку[π/6;5π/6]:
(cos⁡3 x+cos⁡x)/(1-sin⁡x )=0
№2
Решить неравенства:
а) 2 cos⁡( x+π/3)<√3;
б) tg(π/4-2x)>1
№3
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