फलन $f(x) = 1 + x + \int\limits_1^x (\ln^2 t + 2 \ln t) \, dt$ का मान जहाँ $f'(x) = 0$ होता है,है:

  • A
    $e^{-1}$
  • B
    $0$
  • C
    $2 e^{-1}$
  • D
    $1 + 2 e^{-1}$

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$\mathop {Limit}\limits_{x \to {x_1}} \,\,\frac{x}{{x - {x_1}}}\,\,\int\limits_{{x_1}}^x {f(t)} \, dt$ का मान ज्ञात कीजिए:

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