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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यदि $f$ अंतराल $(0, 6)$ में अवकलनीय है और $f'(4) = 5$ है,तो $\lim_{x \to 2} \frac{f(4) - f(x^2)}{2 - x} = $ का मान ज्ञात कीजिए।

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