$\int \frac{\tan^{-1} x - \cot^{-1} x}{\tan^{-1} x + \cot^{-1} x} \, dx$ का मान ज्ञात कीजिए।

  • A
    $\frac{4}{\pi} x \tan^{-1} x + \frac{2}{\pi} \ln(1 + x^2) - x + c$
  • B
    $\frac{4}{\pi} x \tan^{-1} x - \frac{2}{\pi} \ln(1 + x^2) + x + c$
  • C
    $\frac{4}{\pi} x \tan^{-1} x + \frac{2}{\pi} \ln(1 + x^2) + x + c$
  • D
    $\frac{4}{\pi} x \tan^{-1} x - \frac{2}{\pi} \ln(1 + x^2) - x + c$

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