यदि $y = \tan^{-1}(\frac{1}{x^2+x+1}) + \tan^{-1}(\frac{1}{x^2+3x+3}) + \tan^{-1}(\frac{1}{x^2+5x+7}) + \dots$ $n$ पदों तक है, तो $y'(0) = $

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

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