જો $\int \frac{(x-1) dx}{(x+1) \sqrt{x^3+x^2+x}} = f(x) + C$ હોય, તો $f(1) =$

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{2 \pi}{5}$
  • C
    $\frac{2 \pi}{3}$
  • D
    $\frac{5 \pi}{6}$

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