若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b1029ae8e4120c872408387aea94a3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536e072eb0439a5e5b430cd55a129374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c627d4ac2a42f2caf0001638e356152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b1029ae8e4120c872408387aea94a3.png)
更新时间:2022-04-21 08:19:08
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【知识点】 用和、差角的正切公式化简、求值解读