在
中,内角
所对的边分别为
,已知
,
,
是
上一点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bed0049999726e62b5b3142bf924fd.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f9caf437daaf34d6075df028e9999a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2033c5a0c513b98dcb9bf7d04a88b6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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更新时间:2017-02-16 09:01:29
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