Question

2cosx-1=0 Помогите решать)

Answer 1

$2cos(x)-1=0 \ 2cos(x)=1 \ cos(x)= frac{1}{2} x=2 pi n_{1} + frac{ pi }{3}$ (n1∈Z)
$x=2 pi n x x_{2} + frac{5 pi }{3}$ (n2∈Z)