题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172615-71657.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172615-16629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172615-90253.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172615-63819.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172615-27424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-25444.gif)
在一个周期内,当
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-46646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-38607.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-23404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-47383.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-38607.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-13058.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-34507.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-49474.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-70998.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-46646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-38607.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-23404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-47383.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172616-38607.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-13058.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-16464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172618-15225.gif)
把
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172618-83781.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172618-16250.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172618-43892.gif)
所以函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172618-39526.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172619-97549.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172619-92347.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172619-95117.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172617-70998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172619-99449.gif)
解析
核心考点
试题【(本小题满分12分)已知函数,,在一个周期内,当时,有最大值为,当时,有最小值为 .(1)求函数表达式;(2)若,求的单调递减区间.】;主要考察你对任意角三角函数的概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172557-84814.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172557-91956.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172557-84814.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172557-81010.gif)
c
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172557-84814.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172557-39652.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172558-96040.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172558-54258.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172558-40975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172558-39015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172558-81841.gif)
(2)若a与b的夹角为
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172559-66480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172559-18866.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172531-29622.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172436-90359.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172436-29615.gif)
(Ⅰ)(设
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172436-62576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172437-52528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172437-60490.gif)
(Ⅱ)在△ABC中,AB=1,
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172438-27935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172438-85769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172352-52408.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172352-33464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172353-48923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172353-98127.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172353-13923.gif)
(Ⅱ)若将函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172353-87672.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172354-90885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172354-86990.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172354-54397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172354-54397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172349-80715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822172349-36231.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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