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【简答题】
如图，已知A、B是单位圆O上的点，C是圆与x轴正半轴的交点，点A的坐标为 ( 3 5 ， 4 5 ) ，点B在第二象限，且△AOB为正三角形． （Ⅰ）求sin∠COA； （Ⅱ）求△BOC的面积．
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