题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043014-29209.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043014-26023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043014-79441.png)
(II)设
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-36861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-33072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-61551.png)
答案
解:(Ⅰ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-14208.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-41701.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043016-54614.png)
平方得,
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043016-46363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043016-65565.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043016-28693.png)
(II)因为
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043017-91442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043017-40687.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043017-96269.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043017-71897.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043017-98814.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043018-26424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043018-81037.png)
所以,当
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043018-81254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-33072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043018-83907.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043019-45930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043015-33072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911043019-81525.png)
解析
核心考点
试题【已知函数.(Ⅰ)若,求的值;(II)设,求函数在区间上的最大值和最小值.】;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/20190911/20190911043010-38491.png)
A.向左平移![]() | B.向右平移![]() |
C.向左平移![]() | D.向右平移![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042954-22625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042954-28927.png)
(Ⅰ)求函数 f (x) 的解析式;
(Ⅱ)在△ABC中,角A,B,C所对的边分别为a,b,c.若f (B)=1,
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042955-69938.png)
且a+c=4,试求b2的值.
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042949-99642.png)
(1) 求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042949-22698.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042949-22698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042949-82297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042940-93488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042940-83417.png)
(1) 求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042940-72518.png)
(2) 求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042940-72518.png)
(3) 若
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042941-90454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042941-45889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042941-45767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042941-40401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042929-15849.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042929-71944.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042929-36438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042930-96819.png)
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