题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001459-44306.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001459-57013.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001459-14684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001500-27310.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001500-21352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001501-63230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001501-68889.png)
解析
试题分析:本题主要考查诱导公式、倍角公式、降幂公式、两角和与差的正弦公式、三角函数最值等基础知识,考查学生的分析问题解决问题的能力、运用数学公式计算的能力,考查学生的数形结合思想.第一问,先利用诱导公式、倍角公式、降幂公式、两角和与差的正弦公式化简表达式,使之化简为
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001501-24187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001502-60112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001502-49909.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001459-44306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001502-73698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001502-68540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001503-46496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001503-73144.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001500-21352.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001459-14684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001503-24467.png)
所以,当
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001503-72786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001503-76449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001500-27310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001501-63230.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001504-70355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001504-50897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001500-27310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001501-68889.png)
核心考点
试题【已知函数.(1)求的值;(2)当时,求函数的最大值和最小值.】;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/20190830/20190830001454-18760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001455-54229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001455-10856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001455-36076.png)
A.![]() | B.![]() | C.3 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001436-62037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001437-67881.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001437-54981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001437-80633.png)
(2)对(1)中的
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001437-80633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001437-39874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001437-14226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001438-29074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001432-35470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001425-92791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190830/20190830001418-10576.png)
A.![]() | B.0 | C.![]() | D.![]() |
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