已知
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f78c1c1e60c97456bfad92538f6bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eecb2b05f00c7e840ff9cb34fa2cee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65f506a999b87b24ab8c6430289ea17.png)
21-22高一·全国·课前预习 查看更多[2]
(已下线)【导学案】第2课时 两角和与差的正弦、余弦、正切公式-2021-2022学年高一数学《新教材同步精典导学案》(人教A版2019必修第一册)(已下线)第十章 三角恒等变换(知识归纳+题型突破)-单元速记·巧练(苏教版2019必修第二册)
更新时间:2021-12-28 23:54:47
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【知识点】 用和、差角的正切公式化简、求值解读
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】在
中,内角A,B,C满足
且
.
(1)求证:
;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c9bcb51024df4a7d1a04e46ca12549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef89e4c99ae9cc39d4892b4f9804ab6c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ec7dde6521bb6d1fa5ed44d5eea561.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6f4e9bb8b453665bfe9b8fa24711cb.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,正方形
的边长为
,
、
分别为
、
上动点,且
的周长为
,设
,
.
![](https://img.xkw.com/dksih/QBM/2021/3/2/2669200040345600/2671901919346688/STEM/62ed7a258377406a9a96ce0fff7c9be2.png?resizew=255)
(1)求
、
之间的函数关系式
;
(2)判断
的大小是否为定值?并说明理由;
(3)设
的面积分别为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a96d18f3d81433794c5b8eeeacb561.png)
![](https://img.xkw.com/dksih/QBM/2021/3/2/2669200040345600/2671901919346688/STEM/62ed7a258377406a9a96ce0fff7c9be2.png?resizew=255)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030314ca026d6b18481682f70f48d19b.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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