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[" 27.In a "/ABC,cos((B+2C+3A)/(2))+cos]...

[" 27.In a "/_ABC,cos((B+2C+3A)/(2))+cos],[[" (1) "((A-B)/(2))=],[" (1) "-1quad (2)0," cos "12^(0)+cos84^(@)+cos132^(@)+]]

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