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已知函数,给出下列四个命题: ①若 ②的最小正周期是; ③在区间上是增函数; ④...

已知函数6ec8aac122bd4f6e,给出下列四个命题:

①若6ec8aac122bd4f6e

6ec8aac122bd4f6e的最小正周期是6ec8aac122bd4f6e

6ec8aac122bd4f6e在区间6ec8aac122bd4f6e上是增函数;

6ec8aac122bd4f6e的图象关于直线6ec8aac122bd4f6e对称;

⑤当6ec8aac122bd4f6e时,6ec8aac122bd4f6e的值域为6ec8aac122bd4f6e

其中正确的命题为                                                                                           (   )

       A.①②④               B.③④⑤               C.②③                 D.③④

 

D 【解析】略
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