(1/2)*sin(4x-10x)+(1/2)*sin(4x+10x)=(1/2)*sin(x-7x)+(1/2)sin(x+7x)
(1/2)*sin(-6x)+(1/2)*sin(14x)=(1/2)*sin(-6x)+(1/2)sin(8x)
sin14x=sin8x
sin14x-sin8x=0
2*sin((14x-8x)/2)*cos((14x+8x)/2)=0
sin3x=0 или cos11x=0
3x=Pik, k ∈ Z или 11x=(Pi/2)+Pin, n ∈ Z
x=(Pi/3)k, k ∈ Z или x=(Pi/22)+(Pi/11)n, n ∈ Z
О т в е т. (Pi/3)k, (Pi/22)+(Pi/11)n, k, n ∈ Z