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曲线y=2x-x3在x=-1处的切线方程为( ) A.x+y+2=0 B.x+y...
曲线y=2x-x3在x=-1处的切线方程为( )
A.x+y+2=0
B.x+y-2=0
C.x-y+2=0
D.x-y-2=0
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