Помогите с решением
на фото..........................................
{cos2x=1/2 {sin3x=-1 1)cos2x=1/2 2x=±π/3+2πn x=±π/6+πn 2)sin3x=-1 3x=-π/2+2πk x=-π/6+2πk/3 3)-π/6+2πk/3=-π/6+πn 2πk/3=πn n=2k/3 3n=2k 4)-π<-π/6+2πk/3<π<br>-π+π/6<2πk/3<π+π/6<br>-5π/6*3/2π-5/4k={-2;-1;0;1}