解题方法
1 . (1)求值:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b2a792f54d15c30311370f204b6066.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b2a792f54d15c30311370f204b6066.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6dbee398f3416c19ff4c2c47ca97f26.png)
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解题方法
2 . 已知
为锐角,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2788b9f792001e2dc1380e2a566566e0.png)
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3 . 已知三个角
,
,
满足
,
(1)若三个角都是直线的倾斜角,已知
,求
的值;
(2)若三个角都是
的内角,请判断
的形状,并给出证明.
![](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/ae512cb71b62247b6edb92ee701a4d61.png)
(1)若三个角都是直线的倾斜角,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3718c142e73a15b5768a10735a388c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a551563a3f2c6b5f3c966b6ed146d94b.png)
(2)若三个角都是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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名校
4 .
(1)苏教版《普通中学教科书数学必修第一册》第70页第16题可得出以下基本不等式:当
,
时,
(当且仅当
时,等号成立).试用上述结论证明:当
时,
;
(2)如图,锐角
(单位为弧度)的终边与单位圆交于点
,作
轴于点
.
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955971972710400/2957941185773568/STEM/fda1db2c-afa0-4d09-9fa7-934c2a8acdf0.png?resizew=212)
(i)利用单位圆与三角函数线证明:当
时,
;
(ii)求
的周长与面积之和的取值范围.
(1)苏教版《普通中学教科书数学必修第一册》第70页第16题可得出以下基本不等式:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b603108c964254b841b9058ffd60ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6eec7d75a66a4407631f75320bb8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae3371f6c2f0038a239e47a6d72a435.png)
(2)如图,锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955971972710400/2957941185773568/STEM/fda1db2c-afa0-4d09-9fa7-934c2a8acdf0.png?resizew=212)
(i)利用单位圆与三角函数线证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6eec7d75a66a4407631f75320bb8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba65bdcf4f2f04f800a496618888f6e.png)
(ii)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56b0348213284a19e2acc5a088fa491.png)
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20-21高一·江苏·课后作业
解题方法
5 . 求证:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370cd955f4d1f8d1a829425eaa64e6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34a4cf3e88ba292fec8aaf926979801.png)
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2021-10-30更新
|
188次组卷
|
3卷引用:7.2 三角函数概念
名校
解题方法
6 . 已知函数
.
(1)求
的值;
(2)求
的最小正周期;
(3)若
为偶函数,写出一个满足条件的
的值,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc88428060e2f53bd14de003dac18120.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38fffbc7ab9882480f4faa72390e23.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded6bf9b3ca7997eb25d85bbea64e30b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
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2022-03-11更新
|
711次组卷
|
3卷引用:北京市首都师范大学附属中学2022届高三下学期开学检测数学试题
20-21高一·江苏·课后作业
7 . 利用三角函数的定义,证明:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1ec2d7289bc848c59d03ef876073d6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008c044f8b1b4f7df0da3a409e80c55d.png)
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解题方法
8 . (1)已知
为第三象限角,化简
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7236e0309e0e96f5643772e56a98b0f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782aa961bf48274ae1d940a4ef87eed2.png)
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20-21高一·江苏·课后作业
9 . 设
,利用直角三角形三边关系,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f1417100bb7ec57a33c6884e2ec871.png)
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10 . 已知以下三个等式的值等于同一个常数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83af203eb16184ce04dcfff294274538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb82f6e8e5c8638add14e9a004918ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0472de91bab2fbf3a06212c3829361.png)
(1)试从三个式子中选择一个,求出这个常数;
(2)根据(1)的计算结果,推广为三角恒等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a264b2ea904ee120e6f64e084e4a2bc0.png)
( )
( )
( );
(3)证明(2)得到的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83af203eb16184ce04dcfff294274538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb82f6e8e5c8638add14e9a004918ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0472de91bab2fbf3a06212c3829361.png)
(1)试从三个式子中选择一个,求出这个常数;
(2)根据(1)的计算结果,推广为三角恒等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a264b2ea904ee120e6f64e084e4a2bc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(3)证明(2)得到的结论.
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