Помогите решить задания

P=Пи, э-принадлежит

1.cosx>-1/2

-2P/3+2Pn>x>2P/3+2Pn, nэz

2.sinx>=1/2

P/6+2Pn<=x<=P-P/6+2Pn, nэz

3. cosx/2>√3/2

-P/6+2Pn<x/2<P/6+2Pn, nэz

-P/3+4Pn<x<P/3+4Pn, nэz

4. sin2x<=-1/2

-P-7P/6+2Pn<=2x<=7P/6+2Pn, nэz

-P/2-7P/12+Pn<=x<=7P/12+Pn, nэz