sin9x(1/cos3xcos6x-1/cos9x)=0 x=Пk/9cos9x-1/2(cos9x-cos3x)=0sin6x=0 x=Пk/6sin3x=0 x=Пk/3общее х=Пl/6x=Пk/9 .
sin9x(1/cos3xcos6x-1/cos9x)=0 x=Пk/9
cos9x-1/2(cos9x-cos3x)=0
sin6x=0 x=Пk/6
sin3x=0 x=Пk/3
общее х=Пl/6
x=Пk/9 .