If $y = \tan^{-1}\left(\frac{4x}{1+5x^2}\right) + \tan^{-1}\left(\frac{3+8x}{8-3x}\right)$,then $\frac{dy}{dx} = $

  • A
    $\frac{1}{1+25x^2}$
  • B
    $\frac{5}{1+25x^2}$
  • C
    $\frac{1}{1+5x^2}$
  • D
    $\frac{5}{1+5x^2}$

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