在
中,
,
,
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fade7d9c2da07d3d1416b8d07665aa1.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4457aacb176adef9b80531504abc44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72cfdd0b9f795b314fdbe718b93f37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5789e427ff8113da4a4457335c0f8a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc219f534ab498c38a49b7b061ef86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fade7d9c2da07d3d1416b8d07665aa1.png)
更新时间:2019-04-10 13:58:30
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【知识点】 求角的余弦值
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(0.94)
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![](https://img.xkw.com/dksih/QBM/2017/5/29/1697580877922304/1697673836601344/STEM/fb83e0a77b5f4840ad95fa240658d65b.png?resizew=109)
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