已知
,
,
,则用
表示![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0665589b4b2cd2d6d27048161a8edeff.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fbdf49cd00af1ff87259836ddd9f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf7e58ab86c1f9969ecac7f5b259f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ccf26194d117a368fcbe2d35a1e9a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0665589b4b2cd2d6d27048161a8edeff.png)
2007高三·上海·竞赛 查看更多[1]
更新时间:2018-12-07 20:49:25
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容易
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【推荐1】若三个角
、
、
成等差数列,公差为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcec425e0dbc39b16e8c47d0ef25461.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcec425e0dbc39b16e8c47d0ef25461.png)
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