यदि $y = \tan^{-1}\left(\frac{1}{1+x+x^2}\right) + \tan^{-1}\left(\frac{1}{x^2+3x+3}\right) + \tan^{-1}\left(\frac{1}{x^2+5x+7}\right)$ है,तो $y'(0)$ का मान ज्ञात कीजिए।

  • A
    $\frac{9}{10}$
  • B
    $\frac{1}{10}$
  • C
    $-\frac{9}{10}$
  • D
    $-\frac{1}{10}$

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