曲线y=x3-4x+2在点(1,-l)处的切线方程为()A.x-y-2=0 B.x-y=0 C.x+y=0 D.27+y-2=0

题目
曲线y=x3-4x+2在点(1,-l)处的切线方程为()

A.x-y-2=0
B.x-y=0
C.x+y=0
D.27+y-2=0

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