यदि $f(\frac{x - 1}{x + 1}) = x + 1$ है, तो $\int f(x) dx = \dots$

  • A
    $2 \log |1 - x| + c$
  • B
    $-2 \log |1 - x| + c$
  • C
    $2 \log |1 + x| + c$
  • D
    $-2 \log |1 + x| + c$

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