题目
题型:不详难度:来源:
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-15355.png)
(1)求方程
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-83582.png)
(2)如果△
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-99860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-13786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-77198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-62537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-36779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-77198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-87212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055448-87212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055449-99507.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-83582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055449-74445.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055449-51723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055449-12836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055450-91932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055450-95705.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055450-51156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055450-61516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055451-92381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055451-39436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055450-95705.png)
所以方程
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-83582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055451-50406.png)
解法二:
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055451-92833.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-83582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055452-20556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055452-28008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055450-95705.png)
所以方程
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055447-83582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055452-75365.png)
(2)由余弦定理,
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055452-64097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055452-20285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055453-89579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055453-81941.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055453-57776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055453-83515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055453-76244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055454-75560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055454-88870.png)
所以此时函数
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055449-99507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055454-59827.png)
解析
核心考点
试题【本题满分14分)本题共有2个小题,第1小题满分6分,第2小题满分8分.已知函数.(1)求方程的解集;(2)如果△的三边,,满足,且边所对的角为,求角的取值范围及】;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/20190911/20190911055436-39951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055436-25708.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055437-98819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055437-32098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055437-59170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055429-97524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055430-78970.png)
(Ⅰ)函数的最小正周期是什么?(Ⅱ)函数在什么区间上是增函数?
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055421-82769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055421-96836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055421-39115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055421-82015.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055422-32563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055422-91652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055422-18522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055422-87758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055413-31561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055413-84205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055413-66768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055414-82841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055414-18305.png)
A.![]() | B.![]() | C.![]() | D.![]() |
已知向量
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055405-23356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055405-34295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055406-59501.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055406-81849.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055406-28529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055406-81849.png)
(3)说明
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055406-81849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911055407-25866.png)
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