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△ABC的内角A,B,C的对边分别为a,b,c.已知cos(A+C)=2cos2. (Ⅰ)求角B的大小; (Ⅱ)若a+c=8,△ABC的面积为,求b.
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高一下学期数学《2017-2018学年黑龙江省哈尔滨三中高一(下)期末数学试卷》真题及答案
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