名校
解题方法
1 . 在
中,角
,
,
的对边分别为
,
,
,已知
,
,
,
为三个相邻的自然数,且
.
(1)证明:
;
(2)若
,
,求
的值.
![](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/ce613eaa5df46a50174085ef5d1087fb.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/c7b9446d7b31f0d6e044cf99deeb20aa.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd23aaafa6a08df860bad3736b2064e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef001eeef468ca21ac0cbb23fd135657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9923f4f4d4e0dbf1e11e4e708e84de2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
您最近一年使用:0次
2020-09-15更新
|
321次组卷
|
3卷引用:天津市2021届高三高考模拟数学试题
名校
解题方法
2 . 在
中,设内角
,
,
的对边分别为
,
,
,且
.
(1)若
,
,
成等比数列,求证:
;
(2)若
(
为锐角),
.求
中
边上的高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/2bd5b9bbd3d22bd2cef53dd4b9691257.png)
(1)若
![](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/9263ce6ace9fd4e5de3c1193f1bdaf8f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efab3e02f14a97f895356890c3bedaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb3aeb227e9a9d25bcb7f6d803d2d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
您最近一年使用:0次
2020-04-11更新
|
933次组卷
|
8卷引用:江西省南昌市进贤县第一中学2021届高三上学期第二次月考数学(文)试题
3 . 已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f396edd5c35da1e64d62974cecf20500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b80201ee4ced12f00afd6bb7350c94c.png)
您最近一年使用:0次
2020-02-05更新
|
315次组卷
|
5卷引用:高中数学解题兵法 第一百二十讲 环肥燕瘦——奇异美
高中数学解题兵法 第一百二十讲 环肥燕瘦——奇异美人教B版(2019) 必修第三册 逆袭之路 7.2 任意角的三角函数 7.2.3 同角三角函数的基本关系式5.5三角恒等变换(已下线)【第三课】5.2.2同角三角函数的基本关系(已下线)【第二练】5.5.1课时1 两角和与差的正弦、余弦公式
4 . 已知函数
.
(1)判断函数
的奇偶性,并给出证明;
(2)若
为第一象限角,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa1ceb5025caa907c3b9063b6f63b66.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b15cd1968bf22f790511b99fb502bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629c629ca44dbd415be269132fa1d893.png)
您最近一年使用:0次
2019-10-09更新
|
482次组卷
|
2卷引用:第4章三角恒等变换单元测试题 2020-2021学年高一下学期数学北师大版(2019)必修第二册