名校
解题方法
1 . 在现实生活中,一个符合实际的函数模型经常是将不同的函数组合得到的,如听音乐家演奏音乐时,我们听到的声音常常就是多种不同乐器产生的声波叠加的结果.在学习了向量和三角函数后,人大附中某研学小组利用所学知识研究若干振幅相同,同频同向的简谐波叠加后,得到新的简谐波的振幅和初相规律,该小组把
(N为正整数)叠加,研究
中的
和
,其中
.
(1)当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46626b75bd7bc420bf32b66e3253b40b.png)
______ .
(2)当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46626b75bd7bc420bf32b66e3253b40b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2073aefa188a89d515b9d32de5d89c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e289d2f03b9a42c8f61858f1c3b32e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52d236ed8d14f8135a0a63d41a351fe.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb55d413f1ab722e17747c8e99f6c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46626b75bd7bc420bf32b66e3253b40b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722068b39032dd59c01afdba985d65be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46626b75bd7bc420bf32b66e3253b40b.png)
您最近一年使用:0次
名校
解题方法
2 . 在
中,内角
的对边分别为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6989b55df101ab1e9f356b5648d59d0.png)
(1)求角
;
(2)已知
,点
是边
上的两个动点(
不重合),记
.
①当
时,设
的面积为
,求
的最小值:
②三角和差化积公式是一组应用广泛的三角恒等变换式,其形式如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c495012cfbb8545f18afeca6e301f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31d2e06753be0f3a773c79ba080e2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14719ec5aeb326d543642762edda66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3912863c92f4fb689d08802d6397dc5.png)
它在工程学、绘图测量学等方面,有着广泛的应用.现记
,请利用该公式,探究是否存在实常数
和
,对于所有满足题意的
,都有
成立?若存在,求出
和
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6989b55df101ab1e9f356b5648d59d0.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274708984dba57fc8a23c58e375a588e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f68ade9c228169668792516571e28a.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734a6a1d319648bb969845a9159cdba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
②三角和差化积公式是一组应用广泛的三角恒等变换式,其形式如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c495012cfbb8545f18afeca6e301f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31d2e06753be0f3a773c79ba080e2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14719ec5aeb326d543642762edda66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3912863c92f4fb689d08802d6397dc5.png)
它在工程学、绘图测量学等方面,有着广泛的应用.现记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec87f241ad67ce8b51b497766886ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faac624f25ebbba44bf8f2c4a84791cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2024-05-04更新
|
271次组卷
|
3卷引用:专题06 解三角形综合大题归类(2) -期末考点大串讲(苏教版(2019))
(已下线)专题06 解三角形综合大题归类(2) -期末考点大串讲(苏教版(2019))广东省广州市真光中学2023-2024学年高一下学期期中考试数学试卷广东省四会中学、广信中学2023-2024学年高一下学期第二次月考数学试题
3 . 变分法是研究变元函数达到极值的必要条件和充要条件,欧拉、拉格朗日等数学家为其奠定了理论基础,其中“平缓函数”是变分法中的一个重要概念.设
是定义域为
的函数,如果对任意的
均成立,则称
是“平缓函数”.
(1)若
.试判断
和
是否为“平缓函数”?并说明理由;(参考公式:①
时,
恒成立;②
.)
(2)若函数
是周期为2的“平缓函数”,证明:对定义域内任意的
,均有
;
(3)设
为定义在
上的函数,且存在正常数
,使得函数
为“平缓函数”.现定义数列
满足:
,试证明:对任意的正整数
.
(参考公式:
且
时,
.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0477d1ddf513166ff0fabd3ee530f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace257e3f8df8fb9d6b7cd552caaab42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1898b8d7f9852b531bab793d7ed14526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fefc229bf0f2f31967a6207ba0787a.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ebaef33ec95792488f08b953ede2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1ab2e5e3dd3a1c768a88eb182b44d9.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6bf90a1bbeea09e1b7206975a99f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b2f6fed0393ea805284e97165adfe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15b0de113b11a0ba267db5121803a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3e9e2c1543e3478ea3bca064fcf900.png)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734ac636f4a1c878bf563fdd2e8ea6d8.png)
您最近一年使用:0次
2024-04-26更新
|
383次组卷
|
3卷引用:专题10 利用微分中值法证明不等式【讲】
(已下线)专题10 利用微分中值法证明不等式【讲】云南省昆明市云南师范大学附属中学2023-2024学年高一下学期教学测评期中卷数学试卷四川省成都市成飞中学2023-2024学年高一下学期5月月考数学试题
4 .
,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7264502e03d841bf3580613457ea27ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11084f939da10441446da59d4f00c9e6.png)
您最近一年使用:0次
名校
解题方法
5 . 已知
为椭圆:
(
)上一点,
,
为左、右焦点,设
,
,若
,则该椭圆的离心率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e49877a18188a806e5bc312264796bf.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280d2a6b2a0d45904635f528319fc635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f1ea4a7412e643e4b47263e434f2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3267f5af8b2f64309db15a2eb1afc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e49877a18188a806e5bc312264796bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/ffb78fce-cf8b-4c06-a6ab-95864f9f4377.png?resizew=172)
您最近一年使用:0次
2024-01-10更新
|
1309次组卷
|
5卷引用:考点12 三角恒等变换公式的综合应用 --2024届高考数学考点总动员【讲】
(已下线)考点12 三角恒等变换公式的综合应用 --2024届高考数学考点总动员【讲】湖南省长沙市第一中学2024届高三上学期月考数学试卷(五)江西省赣州市南康中学2024届高三上学期七省联考考前数学猜题卷(九)江西省宜春市丰城市第九中学2023-2024学年高一上学期期末数学试题湖南省大联考长沙市一中2024届高三上学期月考数学试卷(五)
6 . 求值:
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e1fdd5c8f2c66909cbdfd10880d243.png)
A.![]() | B.![]() | C.1 | D.![]() |
您最近一年使用:0次
2023-11-02更新
|
2507次组卷
|
6卷引用:第四章 三角函数与解三角形 专题 12 三角恒等变换中的求值问题 高中数学优质试题一题多解和变式训练
(已下线)第四章 三角函数与解三角形 专题 12 三角恒等变换中的求值问题 高中数学优质试题一题多解和变式训练(已下线)【公式证明】和差公式 口诀处置(已下线)8.2.4 三角恒等变换的应用-【帮课堂】(人教B版2019必修第三册)(已下线)专题05 三角函数4-2024年高一数学寒假作业单元合订本湖南省2024届高三数学新改革适应性训练二(九省联考题型)江苏省苏州市梁丰高级中学2023-2024学年高三上学期10月模拟数学试题
7 .
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb3bd6eb4d4e07d7f758f12c928024c.png)
A.![]() | B.![]() | C.![]() | D.前三个答案都不对 |
您最近一年使用:0次
名校
8 . 已知O为坐标原点,点,
,
,
,则( )
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2023-06-13更新
|
680次组卷
|
4卷引用:专题07 向量应用-《重难点题型·高分突破》(苏教版2019必修第二册)
(已下线)专题07 向量应用-《重难点题型·高分突破》(苏教版2019必修第二册)(已下线)专题08 两角和与差的三角函数-《重难点题型·高分突破》(苏教版2019必修第二册)重庆市西南大学附属中学2022-2023学年高一下学期5月月考数学试题江西省宁冈中学2023-2024学年高二上学期开学考试数学试题
9 . 设
是定义域为
的函数,如果对任意的
、
均成立, 则称
是“平缓函数”.
(1)若
, 试判断
和
是否为“平缓函数” ? 并说明理由; (参考公式:
时,
恒成立)
(2)若函数
是“平缓函数”, 且
是以 1为周期的周期函数, 证明:对任意的
、
, 均有
;
(3)设
为定义在
上函数, 且存在正常数
使得函数
为“平缓函数”. 现定义数列
满足:
, 试证明:对任意的正整数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1076aeb555debc8bf15c586375d64c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2fe919afe3583b1ef0dadbd23102a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70458945dae62f8f6a553dfaa8eb723a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b40b099989abb2d15ddf60413c8a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640461197eaf70c0ebe1eb89daf383c1.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33890c6b0bf167514d44139d9dca0154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a2b43fdce5aaae58c0907de23cbc6c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6bf90a1bbeea09e1b7206975a99f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66efdaa9fe939b2b1a7326aaf5e35d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f422484ad3a17eeebc4d15a3fb6289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848ea90ecbd6c506a78058f983ff5614.png)
您最近一年使用:0次
解题方法
10 . 在
中,
对应的边分别为
,且
.且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c9b04e29a3334fd8f6156e6e1f8aa1.png)
(1)求
;
(2)若
,
上有一动点
(异于B、C),将
沿AP折起使BP与CP夹角为
,求
与平面
所成角正弦值的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271edf347d9890c3b4838fa35fc2b298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c9b04e29a3334fd8f6156e6e1f8aa1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668c8ab5abdba7173bcbe573ae87dad4.png)
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