2sin x -1 >= 0
2sin x >= 1
sinx >= 0.5
п\6 + 2пK < =x< =5п\6+2пK, K∈z
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2sin x -1 >= 0
2sin x >= 1
sinx >= 0.5
п\6 + 2пK < =x< =5п\6+2пK, K∈z