题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050343-89825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050343-51300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-97865.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-52395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-99803.png)
(Ⅱ)在
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-26986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050345-72006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050345-97564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050345-93795.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050345-81324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050345-74371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050346-18455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050346-70834.png)
解析
试题分析:(1)根据三角跟等变换化简可得
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050346-17312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050346-41570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-52395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050347-73516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-99803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050347-91878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050347-75445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050346-70834.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050347-41249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050348-42695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050348-19830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050348-20615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050348-62360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050344-99803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050345-74371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050346-18455.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050349-18430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050349-22836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050349-17513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050349-99701.png)
由余弦定理:
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050350-52855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050350-12957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050350-94434.png)
核心考点
试题【已知函数的周期为,其中.(Ⅰ)求的值及函数的单调递增区间;(Ⅱ)在中,设内角A、B、C所对边的长分别为a、b、c,若,,f(A)=,求b的值.】;主要考察你对两角和与差的三角函数等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050321-11188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050321-50433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050321-10866.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050321-43703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050322-32576.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050322-30003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050322-79707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050322-30646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050314-13548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050314-94649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050314-71217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050315-51763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050315-60004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050244-12387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050244-71799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050215-25130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050215-33037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050215-71905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050216-98646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050205-97672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190923/20190923050205-24846.png)
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