यदि $\int_1^2 \frac{dx}{(x^2-2x+4)^{\frac{3}{2}}} = \frac{k}{k+5}$ है,तो $k$ का मान ज्ञात कीजिए।

  • A
    $1$
  • B
    $2$
  • C
    -$1$
  • D
    -$2$

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$\int_{0}^{1} \tan^{-1}\left(\frac{2x}{1-x^2}\right) dx =$

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यदि $\int_{\pi/6}^{\pi/4} (\cot (x - \frac{\pi}{3}) \cot (x + \frac{\pi}{3}) + 1) dx = a \log_e (\sqrt{3} - 1)$ है, तो $9a^2$ का मान . . . . . . . है।

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