यदि $y = \sin^{-1}\left(\frac{19}{20}x\right) + \cos^{-1}\left(\frac{19}{20}x\right)$ है,तो $\frac{dy}{dx} = $

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    इनमें से कोई नहीं

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$\tan \left(\cos ^{-1}\left(\frac{4}{5}\right)+\tan ^{-1}\left(\frac{2}{3}\right)\right)$ का मान है

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