解题方法
1 . 定义运算
,
,
,若
,
,则平面区域
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcce2ee1aded3582e48901cb947b8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d703708ff72790bb95bd941a40c9bf16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be4830993198a70b45c3f2fdfaec4732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e165c88aaecc1b6f14aa90a7cf2666.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1f33b3e70ac0fbde45cf4113308ac6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01841f750224f4592ab124d55601d53.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 已知同一平面内的单位向量
,
,
,则
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/decd249634d157b89dd35ece5d3ceea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32f791072b02715d833eb4f093d48b6.png)
您最近一年使用:0次
2020-07-09更新
|
1847次组卷
|
4卷引用:浙江省湖州市2019-2020学年高二下学期期末数学试题
浙江省湖州市2019-2020学年高二下学期期末数学试题新疆喀什市喀什大学附属中学2023-2024学年高一下学期3月月考数学试题(已下线)2022年高考浙江数学高考真题变式题7-9题(已下线)2022年高考浙江数学高考真题变式题16-18题
名校
解题方法
3 . 已知函数
.
(1)若
为锐角,
,
,求
及
的值;
(2)函数
,若对任意
都有
恒成立,求实数
的最大值;
(3)已知
,
,求
及
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368c73c5b1fc66954165a11ebd9bba5e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b954d1f9144e173c0c5d0ad7ad9eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db73deb6fa502e49e3c873ef076fbc32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfec7685088a43a76b6047832eb06ca.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d03f668e16e4ae8527e3ee741eaa99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34678cf07a992840399ea3bdcdc40b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928914a3d54b81e071af1b5bcf35d149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15100cab0a8f1fb3a2668fb0d20ef38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
您最近一年使用:0次
2020-05-25更新
|
1273次组卷
|
3卷引用:江苏省无锡市天一中学2019-2020学年高一下学期期中数学试题
江苏省无锡市天一中学2019-2020学年高一下学期期中数学试题(已下线)专题20 三角函数中的压轴题(二)-【尖子生专用】2021-2022学年高一数学考点培优训练(人教A版2019必修第一册)江苏省南京师范大学附属中学江宁分校2021-2022学年高一下学期期中数学试题
4 . 在复平面内,设
为坐标原点,点
所对应的复数分别为
,且
的辐角主值分别为
,模长均为1.若
的重心
对应的复数为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d860cb86e1467ac24010aecfc7a425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d860cb86e1467ac24010aecfc7a425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9baca3aafb52803b02ba8b2604e0827c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673f7e66c2a252da4c77c70d90c8cec.png)
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2020-03-01更新
|
1015次组卷
|
2卷引用:人教A版(2019) 必修第二册 突围者 第七章 第三节 课时1 复数的三角表示式
名校
解题方法
5 . 在
中,角
、
、
所对的边分别为
、
、
,若
为锐角三角形,且满足
,则
的取值范围是_______________ .
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c85a40518b5652906fc162f6b43f84b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be772b51d3eb60305b5f65e756cdd418.png)
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2020-02-29更新
|
1106次组卷
|
2卷引用:江苏省泰州中学2018-2019学年高一下学期期中数学试题
解题方法
6 . 在推导很多三角恒等变换公式时,我们可以利用平面向量的有关知识来研究,在一定程度上可以简化推理过程.如我们就可以利用平面向量来推导两角差的余弦公式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
具体过程如下:
如图,在平面直角坐标系
内作单位圆O,以
为始边作角
.它们的终边与单位圆O的交点分别为A,B.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/3378e1b0-11ac-4e21-89d7-e7bef545c1e9.png?resizew=334)
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98717138350884b83b2bc3335ac3262.png)
由向量数量积的坐标表示,有:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437ebce60a1d755209353f0d94462154.png)
设
的夹角为θ,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665d77a90728ca9eb4d63b07dbe89e80.png)
另一方面,由图3.1—3(1)可知,
;由图可知,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8e003e58-f755-4f57-ba40-42e3c44c2f0e.png?resizew=348)
.于是
.
所以
,也有
,
所以,对于任意角
有:
(
)
此公式给出了任意角
的正弦、余弦值与其差角
的余弦值之间的关系,称为差角的余弦公式,简记作
.
有了公式
以后,我们只要知道
的值,就可以求得
的值了.
阅读以上材料,利用下图单位圆及相关数据(图中M是AB的中点),采取类似方法(用其他方法解答正确同等给分)解决下列问题:
(1)判断
是否正确?(不需要证明)
(2)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889623d5e61054f38a35aedd644c9ff5.png)
(3)利用以上结论求函数
的单调区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
具体过程如下:
如图,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa404d3ff313b0a28a76a48d7d87234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/3378e1b0-11ac-4e21-89d7-e7bef545c1e9.png?resizew=334)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98717138350884b83b2bc3335ac3262.png)
由向量数量积的坐标表示,有:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437ebce60a1d755209353f0d94462154.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538844ce819df320039e394ba92356f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665d77a90728ca9eb4d63b07dbe89e80.png)
另一方面,由图3.1—3(1)可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655ee7e11f540619722504916419e009.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8e003e58-f755-4f57-ba40-42e3c44c2f0e.png?resizew=348)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18eedcc65589e7529da85a578bd0ecb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e366809cf946d825277ad151abb374a2.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a689c643b92f5fafe77fb2c754b0184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
所以,对于任意角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74ca761ffa2566a9851c5ce9ccaaf.png)
此公式给出了任意角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd927b4b5a7875528c1b54aa4bb8b2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74ca761ffa2566a9851c5ce9ccaaf.png)
有了公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e74ca761ffa2566a9851c5ce9ccaaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1455db71a4123b3317dcfce3e2005e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d521f8d021b20757d7a68107fcef1d.png)
阅读以上材料,利用下图单位圆及相关数据(图中M是AB的中点),采取类似方法(用其他方法解答正确同等给分)解决下列问题:
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f93aa4ff886e380c9b7c05dbafd08d.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889623d5e61054f38a35aedd644c9ff5.png)
(3)利用以上结论求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1414c4eb3a476aac49f6a35d62b1f7ac.png)
您最近一年使用:0次
2020-05-22更新
|
713次组卷
|
3卷引用:贵阳市普通高中2018-2019学年度高一上学期数学期末质量监测试题
贵阳市普通高中2018-2019学年度高一上学期数学期末质量监测试题贵州省贵阳市2018-2019学年高一(上)期末数学试题(已下线)大题好拿分期中考前必做30题(压轴版)-2020-2021学年高一数学下册期中期末考试高分直通车(沪教版2020必修第二册)
名校
7 . 已知
.
(1)求
;
(2)若
,求
;
(3)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec472a86c2e8e13ff72adb50f375fd75.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e9ef817fd355fca7a0f96bed0800bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1672d0eecc9c890906bd5c2a2c9276cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f9137ced401ef63821931253b9a59d.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73f84d6ec94f5444042336ecb8e6b15.png)
您最近一年使用:0次
名校
解题方法
8 . 在锐角三角形
中,内角A,B,C所对边的边长分别为a,b,c,若
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b269069e460c7ab1d90ee9bac7bd876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88050fbeab0faab61d7d36ff148c6cb1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 已知
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d774341a96ad18e220e5cb4d528203f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22552891eed68edf11b74d88928d7567.png)
您最近一年使用:0次
2019-11-14更新
|
1913次组卷
|
2卷引用:上海市奉贤中学2018-2019学年高一(贯通班)上学期12月份阶段性测试四数学试题
名校
10 . 若
的三个内角
满足
,试判断
的形状.(提示:如果需要,也可以直接利用19题阅读材料及结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef54b681bd6123f5cfc3e28160f4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次