यदि $\sin ^{-1}\left(\frac{x}{5}\right) + \csc ^{-1}\left(\frac{5}{4}\right) = \frac{\pi}{2}$ है,तो $x = $

  • A
    $4$
  • B
    $5$
  • C
    $1$
  • D
    $3$

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अवकलज ज्ञात कीजिए: $\frac{d}{dx} \cos^{-1} \left( \frac{x - x^{-1}}{x + x^{-1}} \right)$

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