यदि $\int_3^b \frac{x-1}{2x-x^2} dx = \frac{1}{2}$ है,तो $(b-1)^2 =$

  • A
    $2$
  • B
    $\sqrt{2}$
  • C
    $1+\frac{3}{e}$
  • D
    $\sqrt{\frac{3}{e}-1}$

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$\int\limits_0^{\sqrt{3}} \frac{1}{2} \frac{d}{dx} \left( \tan^{-1} \frac{2x}{1-x^2} \right) dx$ का मान ज्ञात कीजिए।

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