sin (x-30)*cos2x=sin (x-30)
sin(x-30)*cos2x-sin(x-30)=0
sin(x-30)(cos2x-1)=0
sin(x-30)=0 cos2x=1
x-30=pi*n 2x=2*pi*n
x=pi*n+30 x=pi*n
ответ: x=pi*n+30; x=pi*n
sin (x-30)*cos2x=sin (x-30)
sin(x-30)*cos2x-sin(x-30)=0
sin(x-30)(cos2x-1)=0
sin(x-30)=0 cos2x=1
x-30=pi*n 2x=2*pi*n
x=pi*n+30 x=pi*n
ответ: x=pi*n+30; x=pi*n