все делю на 3
tg(x/6)<1/√3
-pi/2+pik<x/6<pi/6+pik
-3pi+6pik<x<pi+6pik; k⊂Z
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все делю на 3
tg(x/6)<1/√3
-pi/2+pik<x/6<pi/6+pik
-3pi+6pik<x<pi+6pik; k⊂Z