2cos<= \/3
Cosx<=\/3 / 2
Arccos a+2 Пn; 2П - arccos a + 2Пn
П/6+2Пn;11П/6 + 2Пn, n € z
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2cos<= \/3
Cosx<=\/3 / 2
Arccos a+2 Пn; 2П - arccos a + 2Пn
П/6+2Пn;11П/6 + 2Пn, n € z