1) 2Sin x Cos x - Cos x = 0
Cos x( 2Sin x -1) = 0
Cos x = 0 или 2Sin x -1 = 0
x = π/2 +πk , k∈Z Sin x = 1/2
x = (-1)^n arcSin 1/2 + nπ , n∈Z
x = (-1)^n π/6 + πn , n∈Z
2) 2Cos 4x Cos 3x = 0
Cos 4x = 0 или Сos 3x = 0
4х = π/2 +πk , k∈Z 3х = π/2 +πk , k∈Z
x = π/8 + πк/4, к∈Z х = π/6 + πк/3 , к∈Z