题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050241-26572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050241-64612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050241-67485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050241-22232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050242-61003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050241-22232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050242-31906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050241-22232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050242-57764.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050243-59434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050243-91942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050244-27506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050244-57272.png)
不妨设
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050244-46575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050244-69788.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050245-76277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050245-46772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050245-72321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050245-78262.png)
不妨设
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050245-33707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050246-33568.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050246-25637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050246-37774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050246-84500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050247-50930.png)
不妨设
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050247-83973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050247-25715.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050247-50697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050247-21602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050248-42287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050248-15309.png)
不妨设
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050248-79087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050249-54520.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050249-66312.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050249-10993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050249-12285.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050249-60845.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050250-93422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050250-14862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050250-95632.png)
核心考点
试题【若2012=,其中为两两不等的非负整数,令=sin,=cos,=tan,则的大小关系是 ( )A.B.C.D.】;主要考察你对正弦函数的图象与性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050220-70404.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050215-41901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050215-40444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050215-61728.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050205-93481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050206-25563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050206-32449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050206-73218.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050206-87584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050207-19803.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050207-35360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050159-54640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050159-89421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050155-89306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050155-27286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050155-14589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050155-85324.png)
(1)求角B的大小;
(2)若角B为锐角,
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911050156-40091.png)
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