在
中,已知
,给出以下四个论断:
①
,②
,③
,④
,其中正确的是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ee26622a95ee0b12c1367595cc69b2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a1fa497e43c5b7cb47b1c12bc84780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df8ae173df74bb104b1bc3e12d9988c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7f8b210e25b21581f4e7f248ce420d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ef6ad524b708679ae2ba6484bc9b52.png)
更新时间:2020-02-15 22:25:13
|
【知识点】 用和、差角的正弦公式化简、求值解读
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【推荐2】在
中,内角
,
,
所对应边分别为
,
,
,若
,且
,
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be4380bdcef1c542604a6ad61642c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac3b8b69940e68721224993ca52157d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a685fd2c3a82d783ec2169cacda9a1e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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