题目内容
(本小题满分13分) 求
的值．
的值．解：原式
···························································· 6分
············································································ 9分
····················································································· 11分
13分
···························································· 6分············································································ 9分····················································································· 11分 13分略
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，则bcosA＋acosB等于( )
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； (2)若
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如果
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