已知
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719a0e80183eb4a9c7ce5b82fe62da96.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68773d21eb81ed550ab85ca0999c03c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/222f87435d6a610b52bca6908ed37add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719a0e80183eb4a9c7ce5b82fe62da96.png)
2020高三上·全国·专题练习 查看更多[2]
更新时间:2021-04-14 22:18:24
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【推荐2】已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9dcd50f6a1b9f85d8758f37731e4be.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731564404a8ec65ab6eed89b7e6f7e06.png)
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【推荐1】阿耶波多第一(Aryabhata I)是已知的印度最早的数学家,对三角学的作出了巨大的贡献,公元6世纪初,他用勾股定理先算出
、
、
的正弦值之后,再用半角公式算出较小角的正弦值,从而获得每隔
的正弦值表.若已知
的正弦值近似为
,则按照阿耶波多第一的方法,可以算出
的正弦值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
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【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942245aece46d6fa4a771afe4ff05929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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