решить неравенство:
cos x/2 < 1/3
cos x/2<1/3
arccos1/3+2πn<x/2< (2π- arccos1/3)+2πn
2arccos1/3+4πn< x<4π- 2arccos1/3+4πn, n∈Z
2arccos1/3+4πn <x< -2arccos1/3+4π(n+1), n∈Z
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cos x/2<1/3
arccos1/3+2πn<x/2< (2π- arccos1/3)+2πn
2arccos1/3+4πn< x<4π- 2arccos1/3+4πn, n∈Z
2arccos1/3+4πn <x< -2arccos1/3+4π(n+1), n∈Z