下面四个命题:
①
在定义域上单调递增;
②若锐角
,
满足
,则
;
③
是定义在
上的偶函数,且在
上是增函数,若
,则
;
④函数
的一个对称中心是
;
其中真命题的序号为______ .
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffa8ddcbbe89ab0f250f56673e2d36c.png)
②若锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/603cff3c965dc438ab872c1b879aece2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b5bb47ea526e3e383897ece150c3f2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a50188f84f379b3d0418c54cbade7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42c49064a9c51c13cacb822e327336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030f1fa39f699ada416f9ffe09f3aecf.png)
④函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39992ca45fddc46f7522b4fc28c081b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e738bce4fa92616b5be79e7c605d8547.png)
其中真命题的序号为
更新时间:2020-02-20 23:56:58
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1ffbc9268ca8eaf0b53657c548880b.png)
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