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△ABC的内角A,B,C所对的边分别为a,b,c,已知sinC﹣cosC=1﹣cos,若△ABC的面积S=(a+b)sinC=,则△ABC的周长为( )
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高三上学期数学《2017-2018学年辽宁省葫芦岛六中高三(上)期中数学试卷(理科)》真题及答案
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