题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083338-34630.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083338-78078.png)
解析
试题分析:利用两角和的正弦公式
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083338-14231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083338-77122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083339-75673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083339-25156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083339-24182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083339-45854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083340-95066.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083340-98739.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083340-24387.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083340-13232.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083340-76028.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083341-42381.png)
另解:
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083339-24182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083339-45854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083341-85137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083341-75277.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083341-13935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083342-30074.png)
代入得
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083342-94920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083342-11410.png)
解得:
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083342-94426.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083343-23937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083343-37972.png)
核心考点
试题【已知的值。】;主要考察你对两角和与差的三角函数等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083332-99127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083333-19259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083333-17993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083333-53582.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083324-83112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083324-29194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083324-56325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083325-29348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083325-82189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083325-88063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083325-54899.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083316-75962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083317-42078.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083252-24898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083252-91365.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921083252-98335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082249-67761.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082249-30875.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082249-14154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082250-51470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082250-64851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082250-39884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190921/20190921082250-14467.png)
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