题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-34669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-64408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-23399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-15136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153204-70988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153204-55377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153204-93960.png)
⑴求角
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-34669.png)
⑵若
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153204-16592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153204-80002.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153205-47328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153205-42044.png)
解析
试题分析:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153205-55195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153205-87826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153205-27520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153206-45133.png)
再结合角
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-34669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153203-34669.png)
(2)利用同角三角函数基本关系中的平方关系
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153206-58351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153206-58061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153204-80002.png)
试题解析:⑴
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153206-47399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153207-99766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153207-16711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153207-35467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153207-94300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153207-98478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153207-95078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153208-40260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153205-47328.png)
⑵由题知
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153208-85258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153208-11267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153208-78195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153209-28225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153209-60257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153209-32104.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153209-32104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153209-52894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153210-24665.png)
核心考点
试题【已知,,是三角形三内角,向量,,且.⑴求角;⑵若,求.】;主要考察你对同角三角函数的基本关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153149-53885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153149-56686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153149-81016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153149-21428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153149-52997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153150-49002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153150-41469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153139-19141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153139-69620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153140-94015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153140-21928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153140-42578.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153141-95968.png)
(2)若点
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153141-27101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153141-30088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153141-11539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153141-67875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153139-19141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153059-91108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153059-92926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153059-62444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153041-91661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153041-76960.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153035-48227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190823/20190823153035-11117.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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