题目
题型:不详难度:来源:
已知向量m=(sinA,cosA),n=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120953-82563.gif)
(Ⅰ)求角A的大小;(Ⅱ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120953-42784.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120953-91399.gif)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120954-54381.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120954-47681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120954-46323.gif)
由A为锐角得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120954-10686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120953-91399.gif)
(Ⅱ)由(Ⅰ)知
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120955-33875.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120955-50462.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120955-46085.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120955-83447.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120956-76268.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120956-86332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120956-13937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120956-29900.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120957-38960.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120956-13937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120956-13937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120954-54381.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120945-29737.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120946-29422.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120946-55473.gif)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120946-30703.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120947-55989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120936-47976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120936-75013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120937-74655.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120937-41216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120937-99915.gif)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120937-76346.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120938-41081.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120938-95520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120930-94360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120930-80781.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120930-49080.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120930-36075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120930-87342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120930-95332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120919-10177.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120919-18271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120919-30076.gif)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120920-97802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120920-76508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120920-46388.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120920-57602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120920-36737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120921-68752.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120921-94538.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120906-49907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120906-28214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120906-79063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120907-96937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120907-45828.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120907-42418.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120907-61714.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120908-61607.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120908-24327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120908-87527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120906-79063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120909-10787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120909-14456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120909-77890.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120909-60144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120907-96937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105120909-60144.gif)
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