题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043204-27957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043205-71382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043205-44141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043205-45037.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043205-69559.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043205-90119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043206-28255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043206-33684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043206-64009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043206-49659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-46069.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-60842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-80257.png)
解析
试题分析:(Ⅰ)由题意可知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-40194.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-70084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043208-99344.png)
(Ⅱ)由余弦定理知:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043208-99872.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043208-15007.png)
又由正弦定理知:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043208-33825.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043209-12455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043209-46415.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043209-87402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043209-21748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043209-48288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043210-67100.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043206-49659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-46069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043207-80257.png)
点评:三角函数的图象和性质是高考中必考的内容,此外二倍角公式、辅助角公式和正弦定理和余弦定理经常综合考查.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043157-75852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043157-29289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043157-54140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043157-10366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043157-46731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043158-11376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043158-37867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043157-75852.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043149-13307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043149-42835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043150-55104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043150-76914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043150-62835.png)
(Ⅰ)求角A的大小;
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043150-46730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043149-13307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043141-85433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043141-60721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043141-64090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043141-96547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043141-73174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043142-59294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043142-37200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043142-52555.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043141-96547.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043142-57809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043143-88122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043143-63081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043143-39611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043134-62174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043134-25210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043134-19835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043134-83270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043134-42632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043134-18594.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043135-51798.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043135-33122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043129-14144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043129-34371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020043129-84446.png)
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