已知
为锐角,且满足
,则
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebef484cdd2ac52a0905c36cc2637a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded7b9ae18dad3e16246da89e8dcb54b.png)
21-22高三上·江苏常州·期中 查看更多[4]
江苏省常州市2021-2022学年高三上学期期中数学试题(已下线)专题5.6 两角和与差的正弦,余弦和正切公式-《聚能闯关》2021-2022学年高一数学提优闯关训练(人教A版2019必修第一册)(已下线)收官卷--备战2022年高考数学一轮复习收官卷(江苏专用)(已下线)第33讲 章末检测五-备战2023年高考数学一轮复习考点帮(新高考专用)
更新时间:2021-12-03 20:41:48
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解题方法
【推荐1】
中,角
、
、
所对的边分别为
、
、
,下列命题正确的是__ (写出正确命题的编号).
①总存在某内角
,使
;
②若
,则
;
③存在某钝角
,有
;
④若
,则
的最小角小于
.
![](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)
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![](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)
①总存在某内角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac4565468b06c44bb55571329d5177a.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c43259cd2775ff4c2e3258ccf9fc56f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4ab6225e5b941cde12606de1eaa845.png)
③存在某钝角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9a198f7af53ea5631c582ece061982.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f96d5956d494182f99283191faec9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
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【推荐2】双曲线
的两条渐近线夹角的余弦值为________ .
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【推荐1】过点
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【推荐2】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa3d3ca8ae9c034b384ba8267808553.png)
_________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2b8dae45cd30a752aedb1ca66c30a.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4690a46dce144f1a1fe565e14df009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa3d3ca8ae9c034b384ba8267808553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2b8dae45cd30a752aedb1ca66c30a.png)
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