यदि $y = \cot^{-1} \left( \frac{1 + x}{1 - x} \right)$ है,तो $\frac{dy}{dx} = $

  • A
    $\frac{1}{1 + x^2}$
  • B
    $-\frac{1}{1 + x^2}$
  • C
    $\frac{2}{1 + x^2}$
  • D
    $-\frac{2}{1 + x^2}$

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यदि $y = \sec^{-1}\left( \frac{\sqrt{x} + 1}{\sqrt{x} - 1} \right) + \sin^{-1}\left( \frac{\sqrt{x} - 1}{\sqrt{x} + 1} \right)$ है,तो $\frac{dy}{dx} = $

यदि $|x|>1$ के लिए,$\tanh ^{-1}\left(\frac{1}{x}\right)+\operatorname{coth}^{-1}(x)=\log _e(f(x))$ है,तो $f(-5)=$

समीकरण $\tan^{-1}(1 + x) + \tan^{-1}(1 - x) = \frac{\pi}{2}$ का एक हल है

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