જો $y = \tan ^{-1}\left(\frac{1}{1+x+x^{2}}\right) + \tan ^{-1}\left(\frac{1}{x^{2}+2x+3}\right) + \tan ^{-1}\left(\frac{1}{x^{2}+5x+7}\right) + \dots + n \text{ પદો}$,તો $y'(0)$ શોધો.

  • A
    $\frac{\pi}{2}$
  • B
    $\frac{2n}{1+n^{2}}$
  • C
    $\frac{n^{2}}{1+n^{2}}$
  • D
    $-\frac{n^{2}}{1+n^{2}}$

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