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>                                                 (    )A...

                                                (    )A...

问题详情:

                                                (    )A...                                                 (     )

                                                (    )A... 第2张      B                                                (    )A... 第3张      C                                                (    )A... 第4张     D                                                (    )A... 第5张

【回答】

D

知识点:三角恒等变换

题型:选择题

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