1 . 已知函数f
=2cos
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0838b3fea2e2f365b9c0deab6a9678ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d8ea5db58cbcac0a130432bb04f986.png)
A.f![]() | B.x=![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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2 . 已知函数
.
(1)
,
,求
的单调递减区间;
(2)若
,
,
的最大值是
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57e9ba6b0c4fee859110389bd408952.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc36a3810dbc58bb330461b48b82dcbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3578fd78c23d45a0f90b6deb7421ff8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6bfdb24ecf5da863405c2b40936ff9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f586f76a544bbceeffb0e710fd9e9f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f1a3feca6218955446108ebad0a524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6bfdb24ecf5da863405c2b40936ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103070abee09399f1e9510a75c3ba9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
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