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函数y=的图象与函数y=2sinπx(-2≤x≤4)的图象所有交点的横坐标之和等...
函数y=
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的图象与函数y=2sinπx(-2≤x≤4)的图象所有交点的横坐标之和等于( )
A.2
B.4
C.6
D.8
考点分析:
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的最小正周期为π,且f(-x)=f(x),则( )
A.f(x)在
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B.f(x)在(
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)单调递减
C.f(x)在(0,
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D.f(x)在(
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,
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023214050376011107/SYS201310232140503760111009_ST/0.png)
与
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均为单位向量,其夹角为θ,有下列四个命题P
1:|
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+
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|>1⇔θ∈[0,
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);P
2:|
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+
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|>1⇔θ∈(
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,π];P
3:|
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-
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|>1⇔θ∈[0,
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);P
4:|
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-
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|>1⇔θ∈(
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,π];其中的真命题是( )
A.P
1,P
4B.P
1,P
3C.P
2,P
3D.P
2,P
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,直线y=x-2及y轴所围成的图形的面积为( )
A.
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B.4
C.
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D.6
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的展开式中各项系数的和为2,则该展开式中常数项为( )
A.-40
B.-20
C.20
D.40
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设直线l过双曲线C的一个焦点,且与C的一条对称轴垂直,l与C交于 A,B两点,|AB|为C的实轴长的2倍,则C的离心率为( )
A.
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B.
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C.2
D.3
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