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

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

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