题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232614-80189.png)
(1)求函数f(x)的最大值和最小正周期。
(2)设A、B、C为⊿ABC的三个内角,若
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232614-83408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232614-16559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232615-74544.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232615-39065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232615-55000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232615-72291.png)
解析
试题分析:(1)利用领个角的和的余弦公式、二倍角化简整理得
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-96189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-67612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-43093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-37777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-43093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232614-16559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-96189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232616-63931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232617-95327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232617-98427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232617-44843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232617-28076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232618-39380.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232618-63657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232618-67010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232618-50765.png)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232618-47693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232619-35163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232619-53324.png)
f(x)的最小正周期
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232619-56757.png)
故函数f(x)的最大值为
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232619-95375.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232614-16559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232620-34489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232620-47506.png)
又C为锐角,∴
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232620-36338.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232620-16960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232620-20388.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232621-32683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232621-87149.png)
核心考点
试题【设函数.(1)求函数f(x)的最大值和最小正周期。(2)设A、B、C为⊿ABC的三个内角,若,,且C为锐角,求.】;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/20190829/20190829232551-44119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232551-45280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232551-58493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232551-10859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232552-96859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232552-39810.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232541-74794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232541-84542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232541-14778.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232541-14778.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232541-14778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232542-41357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232542-34372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232542-21217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232542-37865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232527-74074.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232521-31791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232521-52618.png)
A.沿![]() ![]() | B.沿![]() ![]() |
C.沿![]() ![]() | D.沿![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232429-73280.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232429-91427.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232429-98493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190829/20190829232430-49931.png)
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