Sin2xcos(x-П/3)-cos2xsin(x-п/3)=0

Question

Sin2xcos(x-П/3)-cos2xsin(x-п/3)=0

Answer 1

Sin(2x-x+π/3)=0
sin(x+π/3)=0
x+π/3=πn,n∈z
x=-π/3+πn,n∈z

Comments

Как тка получается? Первая строчка?