[img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606144451_27181.png" alt="" />（）
A. bsin a
B. bcosa
C.bsin f (a)
D.bcos f (a)
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正确答案： B 答案分析：img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606144744_11518.png" alt="" />
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