sinx*cos2x*cos4x=1/8

Sinx*cosx*cos2x*cos4x=1/8*cosx

1/2sin2xcos2xcos4x=1/8cosx

1/4sin4xcos4x=1/8cosx

1/8sin8x=1/8cosx

sin8x-cosx=0

sin8x-sin (П/2-x) = 0

2sin (4,5x-П/4) cos (3,5x+П/4) = 0

9/2x-П/4=Пk 9/2x=П/4+Пk x=П/18+2 Пk/9

П/4+7/2x=П/2+Пk

7/2x=П/4+Пk

x=П/14+2 Пk/7