英国数学家布鲁克泰勒通过研究发现了如下正、余弦公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ab08491d327ffd0cfabccb639e6030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c868fcf317426476af632cac3c028629.png)
其中
,
,
,例如:
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c510ee5e16312f9d01fb3e24cd28d8.png)
在
中,已知
,
弧度,
米,则BC的长约为_________ 米(精确到0.01米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ab08491d327ffd0cfabccb639e6030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c868fcf317426476af632cac3c028629.png)
其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80c875ad8fafc41d5c82baf23bb5e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ef8db418ece9675eecd645717806ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306da3f46a4e2a78bb84727e26b5ea9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c510ee5e16312f9d01fb3e24cd28d8.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddda8bee262f17d51ee3d70cf63d6b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1cf0ae3ce752f851cceca482cbec31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
更新时间:2021-07-10 15:31:59
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【推荐2】已知
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