Решите плиз срочно,а то не допустят на сессию : 1) Cos20Cos40Cos80 
2) -ctgx(2cosx+)=2sinx
3) 2sin²2x+2cos²x>3
4) 2sin²x+sinx-1
          sinx-1      >0 120 БАЛЛОВ!!!
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