若f(x)=(x+a)(x-4)为偶函数,则实数a= .
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设定义在R上的函数f(x)是最小正周期2π的偶函数,f′(x)是函数f(x)的导函数,当x∈[0,π]时,0<f(x)<1; 当x∈(0,π) 且x≠
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时,(x-
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)f′(x)>0,则函数y=f(x)-sinx在[-2π,2π]上的零点个数为( )
A.2
B.4
C.5
D.8
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在等差数列
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的值等于( )
A.-2011
B.-2012
C.-2010
D.-2013
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在△ABC中,AB=4,∠ABC=30°,D是边
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上的一点,且
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,则
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的值等于( )
A.-4
B.0
C.4
D.8
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若曲线
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处的切线分别为l
1,l
2,且l
1⊥l
2,则a的值为( )
A.-2
B.2
C.
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D.-
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将函数f(x)=sin2x的图象向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100456513066325/SYS201311031004565130663007_ST/0.png)
个单位长度得到函数g(x)的图象,则函数g(x)图象的一条对称轴是( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100456513066325/SYS201311031004565130663007_ST/3.png)
D.
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