यदि $f(x) = \cos^{-1} \left[ \frac{1 - (\log x)^2}{1 + (\log x)^2} \right]$ है,तो $f'(e) = \_\_\_\_$

  • A
    $1/e$
  • B
    $2/e^2$
  • C
    $2/e$
  • D
    $1$

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$\frac{d}{dx} \left\{ \cos^{-1} \left( \frac{1 - x^2}{1 + x^2} \right) \right\} = $

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$\frac{d}{dx}\left( \tan^{-1} \left( \frac{\cos x}{1 + \sin x} \right) \right) = $

$\tan ^{-1} \sqrt{\frac{1-x}{1+x}}$ का $\cos ^{-1}\left(4 x^3-3 x\right)$ के सापेक्ष अवकलन क्या है?

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