已知
,α为锐角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd1e5e1de75ad6deab45a8a2d290d91.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63bd70e4cd466b1cd4c46331c81ecb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd1e5e1de75ad6deab45a8a2d290d91.png)
更新时间:2021-07-31 22:08:10
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