名校
1 . 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
,
,
为坐标原点,定义余弦相似度为
,余弦距离为
.已知
,
,
,若
,
的余弦距离为
,
,
的余弦距离为
,且
,则
( )
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4419304ab2ce7092cbff1ba2c397d6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375429b71e41bc551db376f2dcc49eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d25b16c46c42068e2d25edfa6b122fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b829711116ac4ee4fb517744061f67c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3191a162acce82151cb3698dfcff89d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.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/46902ee9fbd30111d7831f1fc7b79641.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 古希腊数学家帕普斯(Pappus,约A.D.290-A.D.350)利用如图所示的几何图形,由
直观简洁地证明了当
为锐角时的一个三角函数公式,这个公式是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092d23ea36f3560d0d1c784c5ed2bef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2024-04-26更新
|
230次组卷
|
3卷引用:江西省南昌市第十九中学2023-2024学年高一下学期5月期中考试数学试题
江西省南昌市第十九中学2023-2024学年高一下学期5月期中考试数学试题北京市中国人民大学附属中学2023-2024学年高一下学期期中练习数学试题(已下线)北京市中国人民大学附属中学2023-2024学年高一下学期期中练习数学试题变式题16-20
名校
解题方法
3 . 已知
,
,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc282dae4ac9132196ac5d13f63b901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ae955c9387d83dea2a7f092208f84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5766a0f6b7b84e50624397a56581810f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789eccebcb591bc45cf119d4a23cd7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90b7a31140ad9c9e32b7d9d508b1e07.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 由倍角公式
,可知
可以表示为
的二次多项式.对于
,我们有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8604f1213464671ae14ff30411929efd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b752c5b70e8bef980994bfbb88df7cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ac6009b4b740312dc0af7045c62549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a08df228aef6b4c7088a9f9753e520.png)
可见
也可以表示成
的三次多项式.
(1)利用上述结论,求
的值;
(2)化简
;并利用此结果求
的值;
(3)已知方程
在
上有三个根,记为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91d0d02d04a3f1b777b0d86e2372e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5ff5a2e7663e6a21ccea3149a10113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e039219978242ec380e66de6cf9bab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8604f1213464671ae14ff30411929efd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b752c5b70e8bef980994bfbb88df7cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ac6009b4b740312dc0af7045c62549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a08df228aef6b4c7088a9f9753e520.png)
可见
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e039219978242ec380e66de6cf9bab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
(1)利用上述结论,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0ac5e4a6ef4f217b2ffb08aea29489.png)
(2)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57e191a75514170400a9af7a1f28013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a88b4e0ab9e63411ab2e1ddb5dcdba6.png)
(3)已知方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b322f4b08de183d0897d4d81050d9e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b8ec9d4206ea66a02de5c4a1e1e911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc6fb329f26c7281c111e8997057cf4.png)
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2024-04-11更新
|
764次组卷
|
4卷引用:江西省南昌市第五高级中学2023-2024学年高一下学期期中考试数学试卷
江西省南昌市第五高级中学2023-2024学年高一下学期期中考试数学试卷江苏省泰州中学2023-2024学年高一下学期期中考试数学试题(已下线)模块三专题2 新定义专练【高一下人教B版】(已下线)专题04 三角函数恒等变形综合大题归类 -期末考点大串讲(苏教版(2019))
名校
解题方法
5 . 已知
,
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d450aea0fb89e956fc4caa3a9c59fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d394016b9fecac73f38cbc4ff18dee2.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2024-04-05更新
|
286次组卷
|
3卷引用:江西省宜春市宜丰中学2023-2024学年高一下学期4月期中考试数学试题
名校
解题方法
6 . 如图,已知直线
,A是直线
,
之间的一定点,并且点A到
,
的距离分别为
,
,B,C分别为直线
,
上的动点,且满足
,则
面积的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1095c036b49c3327baaa2c3c7f746134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b53eab97158937f92039c1e133b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f285174fbf90a9742de57c1e53224cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86c589939053ce21ce0a67cf40054a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/8/1242bf14-4921-4eed-a1ae-bec984e52781.png?resizew=160)
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2023-07-06更新
|
500次组卷
|
3卷引用:江西省萍乡市安源中学2022-2023学年高一下学期期中考试数学试题
名校
解题方法
7 . 给出定义:对于向量
,若函数
,则称向量
为函数
的伴随向量,同时称函数
为向量
的伴随函数.
(1)设向量
的伴随函数为
,若
,且
,求
的值;
(2)已知
,
,函数
的伴随向量为
,请问函数
的图象上是否存在一点
,使得
,若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bc1dfaf43fa06b6b08b2d0dda1c780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7aa1233d7a93113281594c41f25c7db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
(1)设向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86d8e2ff12570b5e15b40ecb8017783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c804b7657cd6d642dac7c8abfe87bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8cf8ccc4c47695a7fb07f2e76980e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a282d19bf2c827a98d4443330f7ca1.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af292f60c635d2bb4c38379c6bd04ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1282cc43ebf4b459832fec04d805989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf2832c65d95e1eeeac2afdfd1d1e3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17552ebd26149393b27a9a76b9451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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2023-05-02更新
|
386次组卷
|
4卷引用:江西省智慧上进联盟2022-2023学年高一下学期期中调测试数学试题
名校
解题方法
8 . 已知
,
,
,
.
(1)求
的值;
(2)求
的大小.
![](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/f39808a787999cf7a197d82623492582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a11cc0db511322a51f45af5ce81848.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb006ea697b63a914eb487073f0abe1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4890c95e8b00e07f5905e1724db8b80a.png)
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2023-04-17更新
|
610次组卷
|
3卷引用:江西师范大学附属中学2022-2023学年高一下学期期中考试数学试题
江西师范大学附属中学2022-2023学年高一下学期期中考试数学试题宁夏吴忠市吴忠中学2022-2023学年高一下学期期中测试数学试题(已下线)8.2.3 倍角公式-【帮课堂】(人教B版2019必修第三册)
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解题方法
9 . 如图是古希腊数学家波克拉底研究的几何图形,此图由三个半圆构成,直径分别为直角三角形
的斜边AB、直角边BC、AC,N为AC的中点,点D在以AC为直径的半圆上,已知以直角边AC,BC为直径的两个半圆的面积之比为3,
,则
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/22d83e64-d920-415b-b69b-60c9aa4cd8b2.png?resizew=170)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b7b3b101b475ab89cd975b05be8c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d87d30a03910d287396f61e2c9c2e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/22d83e64-d920-415b-b69b-60c9aa4cd8b2.png?resizew=170)
A.![]() | B.![]() | C.![]() | D.![]() |
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2023-03-28更新
|
500次组卷
|
4卷引用:江西师范大学附属中学2022-2023学年高一下学期期中考试数学试题
名校
解题方法
10 . 已知锐角
中,角A,B,C的对边分别为a,b,c .若
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9241b0c0466e266c792a157ec341b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06bc94ce909c6621342d51b70a9020e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549a1ef7579b098d18405ba2b2d4913b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5a94417d0d62715ea4067280d733df.png)
A.9 | B.8 | C.5 | D.4 |
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2023-03-16更新
|
990次组卷
|
9卷引用:江西省湖口中学2022-2023学年高一下学期5月期中考试数学试题
江西省湖口中学2022-2023学年高一下学期5月期中考试数学试题河南省焦作市博爱县第一中学2023-2024学年高一下学期4月期中考试数学试题河南省大联考2022-2023学年高一下学期阶段性测试(三)数学试题河北省衡水市武强中学2022-2023学年高一下学期3月调研数学试题(已下线)河北省石家庄市精英中学2022-2023学年高一下学期第一次月考数学试题(已下线)专题04 正余弦定理解三角形(2) -期中期末考点大串讲河南省郑州市第二十四中学等3校2022-2023学年高一下学期3月月考数学试题(已下线)重难点专题01 正弦定理与余弦定理-2022-2023学年高一数学重难点题型分类必刷题(人教B版2019必修第四册)河北省沧州市泊头市第一中学2023-2024学年高一下学期3月月考数学试题