$\tan^{-1} \left( \frac{\sqrt{1 + x^2} - 1}{x} \right) = $

  • A
    $\tan^{-1} x$
  • B
    $\frac{1}{2} \tan^{-1} x$
  • C
    $2 \tan^{-1} x$
  • D
    इनमें से कोई नहीं

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यदि $y=\tan ^{-1}\left(\frac{3 x-x^3}{1-3 x^2}\right)+\tan ^{-1}\left(\frac{4 x-4 x^3}{1-6 x^2+x^4}\right)$ है, तो $\frac{d y}{d x}$ का मान क्या होगा?

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