函数y=9x-2•3x+2(-1≤x≤1)的最小值是 .
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已知函数f(x)的定义域为(-∞,0)∪(0,+∞)且对定义域中任意x均有:f(x)•f(-x)=1,
g(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748015_ST/0.png)
,则g(x)( )
A.是奇函数
B.是偶函数
C.既是奇函数又是偶函数
D.既非奇函数又非偶函数
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已知向量
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,记函数f(x)=
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,
若函数f(x)的最小正周期为π.
(1)求ω的值;
(2)当0<x≤
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时,试求f(x)的值域;
(3)求f(x)在[0,π]上的单调递增区间.
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已知:
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、
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、
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是同一平面内的三个向量,其中
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=(1,2)
(1)若|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748013_ST/4.png)
|=2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748013_ST/5.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748013_ST/6.png)
∥
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,求
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的坐标;
(2)若|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748013_ST/9.png)
|=
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,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748013_ST/11.png)
+2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748013_ST/12.png)
与2
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-
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垂直,求
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与
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的夹角θ.
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748012_ST/0.png)
,α,β为锐角,求sin(α-β),tan(α+2β).
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已知α,β都是锐角,sinα=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748011_ST/0.png)
,cos(α+β)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971574878/SYS201311012309279715748011_ST/1.png)
,则sinβ的值等于
.
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