已知,求的值;                                                ...

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问题详情:

已知已知,求的值;                                                ...,求已知,求的值;                                                ... 第2张的值;                                                                                                                 

【回答】

已知,求的值;                                                ... 第3张

知识点:三角恒等变换

题型:解答题

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