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设函数f(x)=sin(ωx+
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)-1(ω>0)的导数f′(x)的最大值为3,则f(x)的图象的一条对称轴的方程是( )
A.x=
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B.x=
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C.x=
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D.x=
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已知函数y=x
2sinx,则y'=( )
A.2xsin
B.x
2cos
C.2xsinx+x
2cos
D.2xcosx+x
2sin
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设f′(x)是函数f(x)的导函数,y=f′(x)的图象如图所示,则y=f(x)的图象最有可能的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971042688/SYS201311012309279710426009_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971042688/SYS201311012309279710426009_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927971042688/SYS201311012309279710426009_ST/images3.png)
D.
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曲线y=x
3-2x
2+4x+5在x=1处的切线方程是( )
A.3x+y+5=0
B.3x+y-5=0
C.3x-y-5=0
D.3x-y+5=0
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命题:“若a
2+b
2=0(a,b∈R),则a=b=0”的逆否命题是( )
A.若a≠b≠0(a,b∈R),则a
2+b
2≠0
B.若a=b≠0(a,b∈R),则a
2+b
2≠0
C.若a≠0且b≠0(a,b∈R),则a
2+b
2≠0
D.若a≠0或b≠0(a,b∈R),则a
2+b
2≠0
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