Question

Решение тригонометрических неравенств !!! 

Answer 1

6) П/6+2Пk<=3x/4<=3п/2+П/6+2Пk
     П/9+8Пk/3<=x<=20П/9+8Пk/3
7) 2п/3+2Пk<3П/2-x<7П/3+2Пk
     -5П/6+2Пk<x<5П/6+2Пk
8) sin(x+П/3)<=1/2
   5П/6+2Пk<=x+П/3<=7П/6+2Пk
   П/2+2Пk<=x<=5П/6+2Пk