Cos(x/3-П/6)=sqrt3/2
Cos(x/3-П/6)=√3/2
x/3-π/6 = π/6+2πn, n∈Z x/3-π/6 = -π/6+2πn, n∈Z
x/3=2π/6+2πn, n∈Z x/3=2πn, n∈Z
x=π + 6πn, n ∈ Z x=6πn, n∈Z