1/2<sinx<=√2/2
sinП/6=1/2
sinП/4=√2/2
П/6+2Пk<x<=П/4+2Пk
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1/2<sinx<=√2/2
sinП/6=1/2
sinП/4=√2/2
П/6+2Пk<x<=П/4+2Пk