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已知tan(α+β)=3,tan(α-β)=5,则tan2α= .
已知tan(α+β)=3,tan(α-β)=5,则tan2α= .
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已知函数f(x)满足:
①定义域为R;
②∀x∈R,有f(x+2)=2f(x);
③当x∈[-1,1]时,f(x)=-|x|+1.
则方程f(x)=log
4|x|在区间[-10,10]内的解个数是( )
A.20
B.12
C.11
D.10
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已知向量
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,
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满足|
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|=1,|
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|=2,且
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与
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方向上的投影与
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在
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方向上的投影相等,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194008_ST/8.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194008_ST/9.png)
|等于( )
A.3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194008_ST/10.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194008_ST/11.png)
D.1
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设函数f(x)在R上可导,其导函数f′(x),且函数f(x)在x=-2处取得极小值,则函数y=xf′(x)的图象可能是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194007_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194007_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194007_ST/images2.png)
D.
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函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194006_ST/0.png)
的最大值与最小值之和为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040819433/SYS201311031023280408194006_ST/1.png)
B.0
C.-1
D.
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