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函数y=cos2x在下列哪个区间上是减函数A.[-,]B.[,]C.[0,]D.[,π]
试题详情
函数y=cos2x在下列哪个区间上是减函数( )
A.[-
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAjCAYAAABGpiBAAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC1SURBVDhPzVPbDcQwCGMydmIdlmGUjOIjJOm1
zaP5qdRIlVBq2QYTwsahDQw+CjIIEWjwsaboi0wE5kVSQdwlBbOi/C7n6M6EC8gENAYlKBfGAElU
N6YsQU2WR6DM4sarRFIH1dpUq6dgIbROwnjttKl+MpZRHOe7y8RXy/dqdyWBc3ydXMTiE5+DPBJR
WzG5jORlW8gdSzcF+aL9PUyYTB4eQj/pjRH4c3me0yaoN/BqwL3cD9ZvW2XpNjY3AAAAAElFTkSu
QmCC
)
,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAjCAYAAABGpiBAAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC1SURBVDhPzVPbDcQwCGMydmIdlmGUjOIjJOm1
zaP5qdRIlVBq2QYTwsahDQw+CjIIEWjwsaboi0wE5kVSQdwlBbOi/C7n6M6EC8gENAYlKBfGAElU
N6YsQU2WR6DM4sarRFIH1dpUq6dgIbROwnjttKl+MpZRHOe7y8RXy/dqdyWBc3ydXMTiE5+DPBJR
WzG5jORlW8gdSzcF+aL9PUyYTB4eQj/pjRH4c3me0yaoN/BqwL3cD9ZvW2XpNjY3AAAAAElFTkSu
QmCC
)
]
B.[
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAjCAYAAABGpiBAAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC1SURBVDhPzVPbDcQwCGMydmIdlmGUjOIjJOm1
zaP5qdRIlVBq2QYTwsahDQw+CjIIEWjwsaboi0wE5kVSQdwlBbOi/C7n6M6EC8gENAYlKBfGAElU
N6YsQU2WR6DM4sarRFIH1dpUq6dgIbROwnjttKl+MpZRHOe7y8RXy/dqdyWBc3ydXMTiE5+DPBJR
WzG5jORlW8gdSzcF+aL9PUyYTB4eQj/pjRH4c3me0yaoN/BqwL3cD9ZvW2XpNjY3AAAAAElFTkSu
QmCC
)
,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAjCAYAAACdHYpiAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAD9SURBVEhLzVSBDYQgDGQyduo6XaajMEq/FOGh
vCBo8pqYqCl31/Naxzcvd/M8PwQQkL1z7OINtCRKFBCDRw56TJ4FZAXDcQjH4URMsApQCyYwLSRF
2pq5PSbNxcTIbD0gAGmKOSCw1kevSruJuf0Lh5kZPYsj8AkgKhwCKIk3RYHRJyUKYBzuc2CLVFVu
RcDHAJGt/gvpPcuu1RHi4UFkrBxuCKwnVeBy3UNRXgpvW/wCBb9ievVbn8QNL17gwVi1TWZfPWxB
ozvZUOcAEltAMrNxWYFIh7gnN1soC2QLQKbzO5EbCspuPFmi1oVJkDYUtAz/B5hP1+uHad7CB8ru
5JS6zIZaAAAAAElFTkSuQmCC
)
]
C.[0,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAjCAYAAABGpiBAAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVDhPzVPRDcUgCGQyd2IdlmEURuEpoEHL
a/rzXmrSRO0F7rgT9MGCBxh9KYgVARSKr5GYLmBE5b4RQrU7IW2N1H/7WuoYm4MYFWqQKDWvaCC0
3VFptIDZtlWgUaUTjxZCHRR7JgpOVgV0KjHioXR2faUtlR35bpv4Xfh+oW54NuNSGjymvEyNfCWT
jZMwb/nJ/n1Xd8SlVMcImiN1BW38jvj6MSW0yrgnN3J+jH+1G4q2aHfyW+gG0avR8TDyk/q3wTf9
Pmk3Xj4tXoBsAAAAAElFTkSuQmCC
)
]
D.[
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAjCAYAAABGpiBAAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADHSURBVDhPzVPRDcUgCGQyd2IdlmEURuEpoEHL
a/rzXmrSRO0F7rgT9MGCBxh9KYgVARSKr5GYLmBE5b4RQrU7IW2N1H/7WuoYm4MYFWqQKDWvaCC0
3VFptIDZtlWgUaUTjxZCHRR7JgpOVgV0KjHioXR2faUtlR35bpv4Xfh+oW54NuNSGjymvEyNfCWT
jZMwb/nJ/n1Xd8SlVMcImiN1BW38jvj6MSW0yrgnN3J+jH+1G4q2aHfyW+gG0avR8TDyk/q3wTf9
Pmk3Xj4tXoBsAAAAAElFTkSuQmCC
)
,π]
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函数y=cos2x在下列哪个区间上是减函数( )
A.[-
,
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B.[
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