Question

Cos(П(x-1)/3) = 1/2 Помогите решить

Answer 1

$cos( \frac{ \pi }{3}(x-1))= \frac{1}{2}\\ \frac{ \pi }{3}(x-1)=б \frac{ \pi }{3} +2 \pi , n\in Z\\x-1=б1+6n, n\in Z\\x=1б1+6n, n\in Z\\\\x_1=2+6n, n\in Z\\x_2=6n, n\in Z$