Cos(p/6-2x)=-1 решите уравнения

Question

Cos(p/6-2x)=-1 решите уравнения

Answer 1

Соs(a)=-1, -> a=p/2
p/2=p/6-2x
2x=p/6-p/2
2x=p/6-3p/6
2x=-2p/6
x=(-2p/6)/2
x=-p/6