解题方法
1 .
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf5d9dd0dae4f03c152d5186b9aa934.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
2 . 我国人脸识别技术处于世界领先地位.所谓人脸识别,就是利用计算机检测样本之间的相似度,余弦距离是检测相似度的常用方法.假设二维空间中有两个点
,
,O为坐标原点,余弦相似度为向量
,
夹角的余弦值,记作
,余弦距离为
.已知
,
,
,若P,Q的余弦距离为
,Q,R的余弦距离为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2b8dae45cd30a752aedb1ca66c30a.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc9656d8286c4d6fa309d6ae347c89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df320d266e857a428ff0bac1eb680bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2376fa0549e6fae46bae54d6ace942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926778fe15991308849cdba1822595a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1b00c13a8bb6db096dd866a2c37dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20bb38fbd8ff8e5f8e985a0babf498d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28a96ee1e62b7fbc1fb0257ad0deeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2b8dae45cd30a752aedb1ca66c30a.png)
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2024-04-04更新
|
532次组卷
|
3卷引用:江苏省常州市联盟学校2023-2024学年高一下学期3月学情调研数学试卷
解题方法
3 . (1)已知
,
,且
及
,求
的值;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ebb96c73c0abf240bdc3f9d1ecec7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411f3adf81c4e428f8ed2a2021fba9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc282dae4ac9132196ac5d13f63b901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a009ce821e3add1f56315dd54826307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72a01ed551bb6cde71b039daf55aa41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07199b7a4423dd44829afe1708feb702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3884b343d76a26b4b85b48987d7064.png)
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4 . 如图,角
的始边为
轴的非负半轴,终边与单位圆相交于点
,将角
的边绕着原点
逆时针旋转
得到角
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6834a22cc57e6dc022c74eae7dac76.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd2cf11c6c05a82f73cff2224bf2424a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6834a22cc57e6dc022c74eae7dac76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/b8e8bc82-76e9-4d38-9aeb-b0a887a94930.png?resizew=150)
您最近一年使用:0次
2024-02-17更新
|
461次组卷
|
3卷引用:江苏省常州市北郊高级中学2023-2024学年高一下学期3月学情调研数学试卷
江苏省常州市北郊高级中学2023-2024学年高一下学期3月学情调研数学试卷云南省昆明市西山区2023-2024学年高一上学期期末考试数学试卷(已下线)8.2.1两角和与差的余弦-同步精品课堂(人教B版2019必修第三册)
名校
解题方法
5 . 已知
,
,
,
.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527e4ff6df4a0c447c09006a0e22db40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f6eca9a9cda6e3f85f5f4d2f121e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0abe98e627d7fde193eff7f7e1931c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2c3fa35b7a6f4a1a947851316258f8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e8a74444275f0fd6ed81998a889590c.png)
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2024-01-25更新
|
1120次组卷
|
4卷引用:江苏省常州市北郊高级中学2023-2024学年高一下学期3月学情调研数学试卷
名校
6 . 已知锐角
,且满足
.
(1)求
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474929dd8e89d9ce37448ae72b48d04f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815186a5768ee05b39608d3edff3237b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
您最近一年使用:0次
2023-06-20更新
|
1316次组卷
|
6卷引用:江苏省常州市联盟学校2022-2023学年高一下学期5月学情调研数学试题
江苏省常州市联盟学校2022-2023学年高一下学期5月学情调研数学试题(已下线)第28讲 三角恒等变换-【暑假自学课】(人教A版2019必修第一册)(已下线)第08讲 5.5.1两角和与差的正弦、余弦和正切公式(第1课时)(1)-【帮课堂】(已下线)第03讲 5.5三角恒等变换+5.6 函数y=Asin(ωx+φ)(1) -【练透核心考点】新疆乌鲁木齐市第十一中学2023-2024学年高一下学期3月月考数学试卷(已下线)模块四 专题2 重组综合练(江苏)
解题方法
7 . 已知
为第二象限角,且满足
.求值:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f436bd158b752facf495edaeb0197ed3.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04acbc2b1dfa7934197277b0981f7fa7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4541181543d0ed3380e058a23e78c22.png)
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解题方法
8 . 如图1是1992年第七届国际数学教育大会(
)的会徽图案,它是由一串直角三角形演化而成的(如图2),其中
,则
__________ ,
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da2151771b90d9d109917c2ca6bb6eb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60733091d0925b590f9cab6be1f71694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e974482ae6343b31711935aba6e9c58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504db841f91b714ea69f224080fe560a.png)
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2023-04-13更新
|
317次组卷
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3卷引用:江苏省常州市前黄高级中学2022-2023学年高一下学期期中适应性练习数学试题
名校
9 . 已知复数
,
为
的共轭复数,则下列结论中一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d860cb86e1467ac24010aecfc7a425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ffa08ed6ed096422af6ff471c569c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
A.![]() | B.若![]() ![]() |
C.![]() | D.若![]() ![]() ![]() |
您最近一年使用:0次
2023-04-13更新
|
715次组卷
|
4卷引用:江苏省常州市前黄高级中学2022-2023学年高一下学期期中适应性练习数学试题
10 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d892b1dd6238c35f723fc02fdf194ece.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e0bfb6d1e3a2bebe296251f0c693e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d892b1dd6238c35f723fc02fdf194ece.png)
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2023-03-09更新
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3卷引用:江苏省常州市武进区前黄实验高级中学2022-2023学年高一下学期第一次阶段检测数学试题
江苏省常州市武进区前黄实验高级中学2022-2023学年高一下学期第一次阶段检测数学试题江苏省宿迁市第一中学2022-2023学年高一下学期3月阶段模拟数学试题(已下线)4.2.1两角和与差的余弦公式及其应用