题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021542-34693.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021542-12125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021543-20732.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021543-46353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021543-15682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021544-77794.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021544-14925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021544-20980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021544-90671.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021545-89685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021545-76743.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021545-73443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021545-95643.png)
(2)由(1)可得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021545-33914.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021545-73443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021546-71788.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021546-68023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021546-73531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021547-77303.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021547-59415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021547-12563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021547-77303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021547-39013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021548-27622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021544-90671.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021548-28569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021548-30562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021547-77303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021548-83255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021549-64283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021549-58856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021548-28569.png)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021544-90671.png)
点评:本题考查向量的数量积公式、向量模的坐标公式、三角形的余弦定理、三角函数的二倍角公式、整体思想求三角函数的最值
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021520-33237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021521-22069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021521-19557.png)
(1)求f(
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021521-96367.png)
(2)求函数f( x)的单调递增区间.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021515-89377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021516-95347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021516-78348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021516-74157.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021509-99920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021509-40498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021510-10953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021510-41643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021510-61509.png)
A.4 | B.![]() | C.2 | D.![]() |
则|a-b|=( )
A.![]() | B.2或![]() | C.-2或0 | D.2或10 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021501-23870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021501-33332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021501-81824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021502-86264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021502-67535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105021502-89828.png)
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