设4/(1-x(来学网))·f(x)=d/dx[f(x)],且f(0)=0,则f(x)等于:
  • A.
    (来学网)(1+x)/(1-x)+c
  • B.
    (来学网)(1-x)/(1+x)+c
  • C.
    (来学网)1n|(1+x)/(1-x)|+c
  • D.
    (来学网)1n|(1-x)/(1+x)|+c