等于                                                     ...

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问题详情:

等于                                                     ...等于                                                                                                   

A.-等于                                                     ... 第2张              B.-等于                                                     ... 第3张                    C.等于                                                     ... 第4张                  D.等于                                                     ... 第5张

【回答】

C

知识点:三角恒等变换

题型:选择题

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