Question

Cosx=(-1/3) х-? объясните

Answer 1

$cosx=-1/3\\x=бarccos(-1/3)+2 \pi n, n\in Z\\x=б( \pi -arccos1/3)+2 \pi n, n\in Z\\\\x_1= \pi -arccos1/3+2 \pi n, n\in Z\\x_2=arccos1/3- \pi +2 \pi n, n\in Z$