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bcos2A的优选攻略

△ABC的三个内角A,B,C所对的边分别为a,b,c,asinAsinB+bcos2A=a,则=(  )A.2...
在△ABC中,asinAsinB+bcos2A=a,则=(  )A.2                    ...
 △ABC的三个内角A、B、C所对的边分别为a,b,c,asinAsinB+bcos2A=,        则...
△ABC的三个内角A,B,C所对的边分别为a,b,c,asinAsinB+bcos2A=,则      A. ...