题目
题型:不详难度:来源:
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答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125124-70396.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125125-80788.png)
解:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125125-50377.png)
连接BD,
∵E、F分别是AB、AD的中点,
∴EF∥BD,且等于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125125-80788.png)
∴BD=12,
∵BD=12,BC=13,CD=5,
∴△BDC是直角三角形,
∴tan C=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125125-57106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125126-18074.png)
故答案为:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125126-18074.png)
核心考点
举一反三
求tan A和sin B的值.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125119-70995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125114-65053.png)
(1)求α的值;
(2)计算
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125115-67391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125107-59740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125107-47080.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125107-78698.gif)
(1)sad 60°= .
(2)对于0°<A<180°,∠A的正对值sad A的取值范围是
(3)如图②,在Rt△ABC中,∠C=90°,sin A
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125107-18431.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125103-47136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125103-12215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125103-61319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125103-63094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104125057-42924.jpg)
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