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在△ABC中,有不等式:sinA/2sinBsinC≤2(3~(1/2))/9,等号成立当且仅当B=C=arccos3~(1/2)/3;
In △ABC, there is an inequality: sinA/2sinBsinC ≤ 2(3~(1/2))/9, and the equal sign holds if and only if B=C=arccos3~(1/2)/3;