已知,且,则等于                                               ...

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问题详情:

已知已知,且,则等于                                               ...,且已知,且,则等于                                               ... 第2张,则已知,且,则等于                                               ... 第3张等于                                                (    )

       A.已知,且,则等于                                               ... 第4张               B.已知,且,则等于                                               ... 第5张                C.已知,且,则等于                                               ... 第6张                 D.已知,且,则等于                                               ... 第7张

【回答】

      D

知识点:三角恒等变换

题型:选择题

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