यदि $f(x) = \cot^{-1} \left( \frac{x^x - x^{-x}}{2} \right)$ है,तो $f'(1)$ का मान ज्ञात कीजिए।

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

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यदि $y=\tan ^{-1}\left[\frac{\log \left(\frac{e}{x^2}\right)}{\log \left(ex^2\right)}\right]+\tan ^{-1}\left[\frac{3+2 \log x}{1-6 \log x}\right]$ है,तो $\frac{d^2 y}{dx^2}=$

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