已知,则等于                                                 ...

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问题详情:

已知已知,则等于                                                 ...,则已知,则等于                                                 ... 第2张等于                                                     

A.已知,则等于                                                 ... 第3张                   B.已知,则等于                                                 ... 第4张                  C.已知,则等于                                                 ... 第5张                   D.已知,则等于                                                 ... 第6张

【回答】

B

知识点:三角函数

题型:选择题

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