$\int \frac{1-x^7}{x(1+x^7)} dx = a \ln |x| + b \ln |x^7+1| + c \Rightarrow (a, b) = $

  • A
    $(1, 2/7)$
  • B
    $(1, -7/2)$
  • C
    $(1, -2/7)$
  • D
    $(2, -2/7)$

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