已知梯形
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d57b4243fa7f6f9c73d11f3123c42ddb.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc2eb149474e10705ae6e719b823807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d57b4243fa7f6f9c73d11f3123c42ddb.png)
更新时间:2020-05-30 21:42:18
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【推荐1】已知
中,角
,
,
的对边分别为
,
,
,若
,
且,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f774cd650f14c8f6e4fe0c6a432768bb.png)
________ .
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【推荐2】在△ABC中,角A,B,C所对的边分别为a,b,c,若
,且
,则sinA+sinC的最大值是 ______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cb2e5d7a82f5dc8671907a6c94ebb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500823cbf3050bbdf087613f8b1b9a1f.png)
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