$\tan ^{-1}\left(\frac{1}{8}\right)+\tan ^{-1}\left(\frac{1}{2}\right)+\tan ^{-1}\left(\frac{1}{5}\right)$ का मान है

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{2}$

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यदि $y = \sec^{-1}\left(\frac{1}{2x^2 - 1}\right)$ है,तो $\frac{dy}{dx}$ ज्ञात कीजिए,जहाँ $0 < x < \frac{1}{\sqrt{2}}$.

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