A.2cos x
B.-2sin xcosx
C.%
D.2x
A.3x-y+1=0
B.3x+y-1=0
C.3x+y+1=0
D.3x-y-1=0
A.2?(x)
B.4?(x)
C.8?(x)
D.12?(x)
A.2cos x
B.-2sin xcosx
C.%
D.2x
A.小于0
B.等于0
C.大于0
D.不确定
A.0.2
B.0.4
C.0.5
D.0.9
A.1/16
B.1/12
C.1/8
D.1/4
A.(1,1)
B.(-1,1)
C.(0,-1)
D.(0,1)
A.0.1
B.0.2
C.0.8
D.0.9
A.必可导
B.必不可导
C.可导与否不确定
D.可导与否与在x0处连续无关
A.2sinxxcosx
B.2cosxxsinx
C.-2sinx+xcosx
D.-2cosx+xsinx
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