题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014603-37759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014603-21921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014603-90876.png)
(1) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014604-71992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014604-10431.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014604-74136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014604-23323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014605-22881.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014605-20199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014605-39463.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014605-50392.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014606-89617.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014606-20766.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014606-78779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014606-22074.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014607-21045.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014607-54132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014607-88643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014607-15208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014608-70695.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014608-47206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014608-79814.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014608-88547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014603-37759.png)
点评:三角函数中公式众多,利用三角函数公式解决问题时,要注意各个公式的适用条件,准确应用.
核心考点
试题【(本小题满分分)已知, ;(1) 若,求的值;(2)若,,求的值.】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014554-63764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014554-27146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014554-22071.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014554-44312.png)
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014555-57760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014555-87161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014555-69753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014555-67191.png)
求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014555-15947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014548-55127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014548-73922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014548-90096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014548-37303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014548-27138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014548-15055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014543-78834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014543-25568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014543-25568.png)
(结果用反三角函数值表示)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014536-97316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014536-83647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014536-40603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014537-59561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014537-57881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014537-98013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014532-23226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104014532-15732.png)
A.![]() | B. 9 | C. 4 | D. -4 |
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