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y=sinx(cosx+1)的导数是( ) A.cos2x-cos B.cos2...
y=sinx(cosx+1)的导数是( )
A.cos2x-cos
B.cos2x+cos
C.cos2x+sin
D.cos2x+cos
考点分析:
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函数
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的导数是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844037617909/SYS201311012308440376179002_ST/1.png)
B.-sin
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844037617909/SYS201311012308440376179002_ST/2.png)
D.
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下列运算正确的是( )
A.(ax
2-bx+c)′=a(x
2)′+b(-x)′
B.(sinx-2x
2)′=(sinx)′-(2)′(x
2)′
C.(cosxsinx)′=(sinx)′cosx+(cosx)′cos
D.[(3+x
2)(2-x
3)]′=2x(2-x
3)+3x
2(3+x
2)
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若3sinα+cosα=0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230837480063248/SYS201311012308374800632004_ST/0.png)
的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230837480063248/SYS201311012308374800632004_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230837480063248/SYS201311012308374800632004_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230837480063248/SYS201311012308374800632004_ST/3.png)
D.-2
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