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函数y=xsinx+cosx在下面哪个区间内是增函数( ) A.(,) B.(π...
函数y=xsinx+cosx在下面哪个区间内是增函数( )
A.(
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,
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)
B.(π,2π)
C.(
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,
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)
D.(2π,3π)
考点分析:
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函数y=xcosx-sinx在下面哪个区间内是增函数( )
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B.(π,2π)
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D.(2π,3π)
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定义在R上的函数f(x)既是偶函数又是周期函数.若f(x)的最小正周期是π,且当x∈[0,
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|x|+
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,有下面四个结论,其中正确结论的个数为( )
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180207371891176/SYS201310241802073718911000_ST/2.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180207371891176/SYS201310241802073718911000_ST/3.png)
④f(x)的最小值是-
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A.1
B.2
C.3
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如图,F是椭圆
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.点C在x轴上,BC⊥BF,B,C,F三点确定的圆M的半径为2.
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