cos(pi/6+x)<-√3/2
5pi/6<pi/6+x<7pi/6-вычту везде pi/6
2pi/3<x<pi
x∈(2pi/3+2pik;pi+2pik;k∈Z)
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cos(pi/6+x)<-√3/2
5pi/6<pi/6+x<7pi/6-вычту везде pi/6
2pi/3<x<pi
x∈(2pi/3+2pik;pi+2pik;k∈Z)