1 . 提鞋(斜)公式,也叫李善兰辅助角公式,是我国19世纪著名数学家李善兰先生提出的一种高等三角函数公式,其正弦型如下:
,其中
.若
,
,则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e0211f9184e02c90a578be2951d727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf1398bfcb7c1c232a19a777814d871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7324254f4d6fade139236d119ca48fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff05e71e87d3cf0c5a293df9ac9beb2.png)
A.当![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() ![]() |
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2023-01-02更新
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333次组卷
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2卷引用:浙江省杭州市第十一中学2022-2023学年高一下学期期中数学试题
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解题方法
2 . 如图,
的顶点A,B分别在x轴的非负半轴,y轴的非负半轴上,
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881652916666368/2885920726016000/STEM/544701e95ceb43249c79e5d84cee0538.png?resizew=119)
(1)求点C到y轴的距离的最大值;
(2)设点M为斜边BC的中点,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881652916666368/2885920726016000/STEM/544701e95ceb43249c79e5d84cee0538.png?resizew=119)
(1)求点C到y轴的距离的最大值;
(2)设点M为斜边BC的中点,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8417983dfa06eb2858c3aa576ec1b5.png)
您最近一年使用:0次