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