मान लीजिए $f : R \rightarrow R$ एक अवकलनीय फलन है और $f(1) = 4$ है। तो $\lim_{x \rightarrow 1} \int_{4}^{f(x)} \frac{2t \, dt}{x - 1}$ का मान ज्ञात कीजिए।

  • A
    $f'(1)$
  • B
    $4f'(1)$
  • C
    $2f'(1)$
  • D
    $8f'(1)$

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