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函数y=2cos2x的一个单调增区间是.A.B.C.D.
试题详情
函数y=2cos
2x的一个单调增区间是( ).
A.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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YII=
)
B.
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jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAcJJREFU
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AABJRU5ErkJggg==
)
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAedJREFU
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70eE5qeRXWMZQIjIiDH3v/Mjcr/P+4ivicg/pH3y9VI0RYwAAAAASUVORK5CYII=
)
D.
相关试题
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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QMhortC6XYb+AEiHwaSIU6ZCAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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PvMDY655C+Q6rIIAAAAASUVORK5CYII=
)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAbpJREFU
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A53LYkOGThOM679AbcMajyDP8Mb1hTLEW+aOp16gHVGV1Hxchn4BerItuCw+3agAAAAASUVORK5C
YII=
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAcJJREFU
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vMquhXXBKAVZqHtp64fLtyjrjAkuInlrQmLzNmhtwxgz82+BLdI5ozOsM0F9N6wPVmeFE6xJ76Zj
n7Jw9arYQZ+AFT7hSoH176BqDC68em8jLL531qblh0XIZlVZ1je4KUStwFNrSJyRVFXhiHz8DNmh
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b8sWHLDAR1HIlpS1aVfwe+ea3pXPSKNyWwiaJ74CS7gH00Bx1rw7OkS045hpl++H/cNtboYl/xYE
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AABJRU5ErkJggg==
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAedJREFU
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)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAG0SURBVFhH7ZiBrcMgDESZjJ1Yh2UYJaP4YyAF
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QMhortC6XYb+AEiHwaSIU6ZCAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAHmSURBVFhH7ZgLroQgDEVZGXtiO2yGpbCUDgWU
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PvMDY655C+Q6rIIAAAAASUVORK5CYII=
)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAG0SURBVFhH7ZiBrcMgDESZjJ1Yh2UYJaP4YyAF
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)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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+Xf5npJITdhS8X4axMWWxOtOYrDNq47lSojVL7CrYdEAqMCSPeQ19pt1IfD5TzIAH71uXamovGqD
S2EJFB0ntomt+Ll10aVQs69JmZZAMc0Oc6f+tjB7zNevSyGk5FybNsk/HGaNyfrXllWW120Mne12
uN65A76aqFpqXlERS5to100Kdw/YyRO9ASz7xzA4k+2wtSa7xbwVFh0gcytXZL2WeRssFlTZ0FRa
VSbzNtgVy3hhV1SbmfMoZT/CdzyDYN2YwwAAAABJRU5ErkJggg==
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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=
)
D.
-
函数y=2cos2x的一个单调增区间是( ).
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADQAAAAjCAYAAADbqynIAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAF+SURBVFhH7ZiBjcMgDEWZjJ1Yh2UYJaP4sEkP
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B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACsAAAAjCAYAAAANDvOtAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAjCAYAAADWtVmPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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D.
-
已知函数f(x)=2
sinxcosx+2cos2x-1(x∈R),g(x)=|f(x)|.
(I)求函数g(x)的单调递减区间;
(II)若A是锐角△ABC的一个内角,且满足f(A)=
,求sin2A的值.