若
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d7258de3ea69c206cd1425a8caf1b6.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9da049c686ff81df5d6645ef51e993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ec5023778a6d4f9bc03c01566d22a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d7258de3ea69c206cd1425a8caf1b6.png)
更新时间:2022-12-26 19:39:04
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【知识点】 已知正(余)弦求余(正)弦解读
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【推荐2】已知
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___________ .
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