曲线y=4x-x3在点(-1,-3)处的切线方程是 .
考点分析:
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设f(x)是一个三次函数,f′(x)为其导函数,如图所示的是y=x•f′(x)的图象的一部分,则f(x)的极大值与极小值分别是( )
A.f(1)与f(-1)
B.f(-1)与f(1)
C.f(-2)与f(2)
D.f(2)与f(-2)
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同时具有性质“①最小正周期是π,②图象关于直线
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对称;③在
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上是增函数”的一个函数是( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347702850/SYS201311012314323477028006_ST/4.png)
D.
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下列命题中是假命题的是( )
A.∃α,β∈R,使cos(α+β)=cosα+sinβ
B.∀x>0,有ln
6x+ln
3x+1>0
C.
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上递减
D.∀ϕ∈R,函数y=sin(2x+ϕ)都不是偶函数
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若对∀a∈(-∞,0),∃x
∈R,使acosx
≤a成立,则
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=( )
A.
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B.
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C.
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D.
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曲线y=x
3+11在点P(1,12)处的切线与x轴交点的横坐标是( )
A.-9
B.-3
C.9
D.15
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