题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-40017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-40017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-50387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-40017.png)
A.-![]() | B.-![]() | C.![]() | D.![]() |
答案
解析
试题分析:根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-40017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-40017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-50387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153448-40017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153449-69511.png)
点评:解决该试题的关键是利用已知的角正弦值,结合角的范围,准确的求解余弦值,平方关系的运用。基础题
核心考点
试题【已知为第二象限角,sin=,则cos=A.-B.-C.D.】;主要考察你对任意角三角函数的概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153410-79968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153411-73293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153412-53303.png)
A.y=sin![]() | B.y=sin![]() |
C.y=sin![]() | D.y=sin![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153407-58173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153407-74376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153407-49085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153407-97700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153408-96778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153408-94203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153340-15143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153340-51781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153340-78402.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153216-51698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153216-33446.png)
① 函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153216-30307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153216-30307.png)
③ 函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153216-30307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153216-30307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153213-74932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153213-49232.png)
A
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153213-15459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153213-95254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153214-92500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822153214-44670.png)
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