यदि $y = \tan^{-1}\left(\frac{1}{x^2 + x + 1}\right) + \tan^{-1}\left(\frac{1}{x^2 + 3x + 3}\right) + \tan^{-1}\left(\frac{1}{x^2 + 5x + 7}\right) + \dots$ $n$ पदों तक है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

  • 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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$x=0$ पर $\tan ^{-1}\left(\frac{\sqrt{1+x^2}-1}{x}\right)$ का $\tan ^{-1}\left(\frac{2 x \sqrt{1-x^2}}{1-2 x^2}\right)$ के सापेक्ष अवकलज ज्ञात कीजिए।

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