Question

2cosx-1=0
решить уравнение

Answer 1

2cosx=1

cosx=1/2

x1=$\frac{\pi}{3}+2\pi k$,k∈z

x2=$-\frac{\pi}{3}+2\pi k$,k∈z

Answer 2

2cosx-1=0
cosx=1/2
x=±arccos1/2+2πk
x=±π/3+2πk;k€Z