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[单选题]
设y=f(x)是可微函数,则d/(cos2x)=().
A.f’(cos2x)sin2xd2x
B.2f’(cos2x)dx
C.2f’(cos2x)sin2xdx
D.-f’(cos2x)sin2xdLx
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A.f’(cos2x)sin2xd2x
B.2f’(cos2x)dx
C.2f’(cos2x)sin2xdx
D.-f’(cos2x)sin2xdLx
设F(x)=,其中a<b,且f(y))为可微函数,求F''(x).
四个图形中的哪一个?
A.sinf'(x)
B.
C.
D.
设函数f(x)在点x可微分,a和b为常数则=().
A.f'(x)
B.(a+b)f'(x)
C.(a-b)f'(x)
D.(a+b)f'(x)/2