(2cos(x)−1)(cos(x)+1)=0
2cos(x)−1=0
cos(x)+1=0
x
=
π/3+2πn;5π/3+2πn,π+2πn
5π/3+2πn≤x≤7π/3+2πn для всех целых n
(2cos(x)−1)(cos(x)+1)=0
2cos(x)−1=0
cos(x)+1=0
x
=
π/3+2πn;5π/3+2πn,π+2πn
5π/3+2πn≤x≤7π/3+2πn для всех целых n