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若平面向量α,β满足|α|=1,|β|≤1,且以向量α,β为邻边的平行四边形的面...
若平面向量α,β满足|α|=1,|β|≤1,且以向量α,β为邻边的平行四边形的面积为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102807464582789/SYS201311031028074645827013_ST/0.png)
,则α和β的夹角θ的范围是
.
考点分析:
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已知函数y=f(x)是定义在R上的奇函数,当x≤0时,f(x)=2x+x
2,若存在正数a,b,使得当x∈[a,b]时,f(x)的值域为[
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],则a+b=( )
A.1
B.
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C.
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D.
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如图所示,A,B,C是圆O上的三个点,CO的延长线与线段AB交于圆内一点D,若
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A.0<x+y<1
B.x+y>1
C.x+y<-1
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是第四象限角,
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,则sinθ的值是( )
A.
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B.
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C.
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D.
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对于函数
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(其中a、b∈R,c∈Z),选取a、b、c的一组值计算f(1)、f(-1),所得结果一定不是( )
A.4和6
B.3和1
C.2和4
D.1和2
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