题目内容
设函数f(x)=sin
+sin
(ω>0)的最小正周期为π,则( )
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824040312619894.png)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824040312619886.png)
A.f(x)在![]() | B.f(x)在![]() |
C.f(x)在![]() | D.f(x)在![]() |
D
依题意得f(x)=2sin ωxcos
=-sin ωx,
=π,所以ω=2,f(x)=-sin 2x,易知该函数在
上单调递减
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824040312697491.png)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824040312713510.png)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824040312650706.png)
![](http://thumb.zyjl.cn/images/loading.gif)
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题目内容
A.f(x)在![]() | B.f(x)在![]() |
C.f(x)在![]() | D.f(x)在![]() |