题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074337-29667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074338-51259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074337-29667.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:由题意
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074339-76379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074337-29667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074338-59790.png)
点评:熟练掌握三角函数的概念及诱导公式是解决此类问题的关键,属基础题
核心考点
举一反三
A.![]() | B.-![]() | C.![]() | D.-![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074332-98655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074327-74974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074327-49744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074327-84189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074328-30546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074328-72327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074328-96217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074328-59972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074328-80674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074329-48622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074329-90603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074329-96317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074324-19328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074324-53369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074325-98453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074325-38402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074316-74309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074316-43672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074316-11051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074317-73703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074317-86659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074317-51487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074317-49653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074317-56791.jpg)
(1)试写出用
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074318-87299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074316-11051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074318-11639.png)
(2)在余下的边角料中在剪出两个圆(如图所示),试问当矩形
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821074316-11051.png)
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