题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-60118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-48073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-28942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-85010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013602-61066.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013602-47208.png)
解析
试题分析:解:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-60118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-48073.png)
∴由
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-28942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013601-85010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013602-58786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013602-58786.png)
由此可得tanα=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013603-61521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013602-58786.png)
结合α为锐角,可得α=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013602-47208.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013554-36962.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013554-52472.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013555-78347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013555-50058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013549-75348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013549-81083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013549-54125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013549-82948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013550-16388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013550-17979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013550-64807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013550-65327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013550-31651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013550-16388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013543-39175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013543-15181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013543-76316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013544-99851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013544-13607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013538-29765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013539-25968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013539-18483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013539-63090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013529-91849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013529-42699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013530-77222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013529-42699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013530-77301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013530-99919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013530-96180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013530-68222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013531-13976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013531-19962.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013529-42699.png)
(2)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013531-26338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013531-51112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105013532-79800.png)
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