જો $y = \tan^{-1}\left(\frac{1}{x^2 + x + 1}\right) + \tan^{-1}\left(\frac{1}{x^2 + 3x + 3}\right) + \tan^{-1}\left(\frac{1}{x^2 + 5x + 7}\right) + \dots$ $n$ પદો સુધી હોય,તો $\frac{dy}{dx}$ ની કિંમત શોધો.

  • A
    $\frac{1}{1 + (x + n)^2} + \frac{1}{1 + x^2}$
  • B
    $\frac{1}{1 + (x + n)^2} - \frac{1}{1 + x^2}$
  • C
    $-\frac{1}{1 + x^2}$
  • D
    $0$

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