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若,且,则=                                            A.-  ...

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若,且,则=                                            A.-  ...,且若,且,则=                                            A.-  ... 第2张,则若,且,则=                                            A.-  ... 第3张=                                            

A.-若,且,则=                                            A.-  ... 第4张                      B.若,且,则=                                            A.-  ... 第5张                          C.若,且,则=                                            A.-  ... 第6张                          D.-若,且,则=                                            A.-  ... 第7张

【回答】

A 

知识点:三角恒等变换

题型:选择题

Tags:A.
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