将函数f（x）=2cos2x的图象向右平移 π6 个单位后得到函数g（x）的图象，若函数g（x）在区间[0， a3 ]和[2a， 7π6 ]上均单调递增，则实数a的取值范围_刷题宝

题干

将函数f（x）=2cos2x的图象向右平移 π

6

个单位后得到函数g（x）的图象，若函数g（x）在区间[0，

a

3

]和[2a， π

7

6

]上均单调递增，则实数a的取值范围是（）

A： $\frac{π}{3}$ ， $\frac{π}{2}$

B： $\frac{π}{6}$ ， $\frac{π}{2}$

C： $\frac{π}{6}$ ， $\frac{π}{3}$

D： $\frac{π}{4}$ ， $\frac{3 π}{8}$

上一题下一题 0.0难度选择题更新时间:2018-07-30 08:09:37

答案(点此获取答案解析）

A

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