试题与答案

下列四个函数中,以π为最小正周期,且在区间(π2,π)上为减函数的是( ) A.y

题型:选择题

题目:

下列四个函数中,以π为最小正周期,且在区间(
π
2
,π)上为减函数的是(  )
A.y=cos2xB.y=2|sinx|C.y=(
1
3
)cosx
D.y=-cotx

答案:

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