1 . 如图,
是两个新建小区,
到公路
的垂直距离分别为
,且
,中国移动决定在线段
两点之间找一个点P建立一个信号塔(P不与
重合),当P对
两地的张角
越大时,信号的辐射范围越大.
![](https://img.xkw.com/dksih/QBM/2021/12/5/2866066726830080/2867440845307904/STEM/e9e09bf2f9134459b1c6668239fb6d88.png?resizew=203)
①当
为直角时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f0ac74a756891b258d4cb46c56a4f2.png)
_________
;
②当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f0ac74a756891b258d4cb46c56a4f2.png)
__________
,信号的辐射范围最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77b273eeededfc2d091589f512cd4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b794623adf533ebfded70d5b44a22d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://img.xkw.com/dksih/QBM/2021/12/5/2866066726830080/2867440845307904/STEM/e9e09bf2f9134459b1c6668239fb6d88.png?resizew=203)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f0ac74a756891b258d4cb46c56a4f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f0ac74a756891b258d4cb46c56a4f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
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2021-12-07更新
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938次组卷
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6卷引用:重庆市巴蜀中学2022届高三上学期高考适应性月考(四)数学试题
重庆市巴蜀中学2022届高三上学期高考适应性月考(四)数学试题(已下线)专题07 三角函数与解三角形问题(讲)--第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测(浙江专用)》(已下线)专题06 三角函数与解三角形问题(讲)--第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测(新高考·全国卷)》(已下线)第八章 解析几何 专题6 有关张角的最值问题 高中数学优质试题一题多解和变式训练(已下线)思想04 运用转化与化归的思想方法解题(4大题型)(练习)(已下线)专题3 最佳视角 米勒定理【讲】
2 . 下列说法正确的有( )
A.命题![]() ![]() |
B.若复数![]() ![]() ![]() ![]() |
C.若平面向量![]() ![]() ![]() ![]() |
D.在△ABC中,若![]() |
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名校
解题方法
3 .
它们的终边分别与单位圆相交于![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b73121ed0f193ea2b7737b6e50f2402.png)
(1)求
;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bb7de4f6f5d7a00ee34e6ec8c29eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b73121ed0f193ea2b7737b6e50f2402.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01df0281109e71a6d0ce8fe477618999.png)
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2021-09-16更新
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237次组卷
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4卷引用:河南省非凡吉创2020-2021学年高一下学期五月调研卷数学试题
名校
4 . 已知在
中,角
,
,
所对应的边分别为
,
,
,
为
所在平面上一点,下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.“![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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2021-08-18更新
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290次组卷
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2卷引用:江苏省苏州市张家港市梁丰高级中学2020-2021学年高一下学期3月份阶段性检测数学试题
名校
5 . 在这春光明媚的季节里,2021江苏省梁丰高级中学“校长杯”班级足球联赛正如火如荼地举行,在高一年级某场比赛中,两个班级的比赛场地为矩形
(如图),现已知矩形中
米,
米,宽为5米的足球门
在边
的中间放置.
![](https://img.xkw.com/dksih/QBM/2021/4/12/2698055334961152/2787503097356288/STEM/b32f0db2-22cc-4a78-921d-d726a3e72802.png?resizew=277)
(1)比赛中,同学甲在距离
为18米,离
为12米的地点
处获得直接任意球机会,准备直接射门,求其有效射门角度;(求出
的某个三角函数值即可)
(2)同学乙在边线
上带球突破(视作点
在
边上移动),准备起脚向球门
射门,求该同学应在何处(
长为多少米时)射门角度最佳.(即使
最大)
(以上问题不考虑场上其他因素)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96d339637b67652b6e259f024aae661b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5c3ccd350ed8aad71fed37ea423b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2021/4/12/2698055334961152/2787503097356288/STEM/b32f0db2-22cc-4a78-921d-d726a3e72802.png?resizew=277)
(1)比赛中,同学甲在距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c965c9363bde4338985d106288292c1c.png)
(2)同学乙在边线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(以上问题不考虑场上其他因素)
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