यदि $f:R \to R$ एक अवकलनीय फलन है और $f(1) = 4$ है,तो $\lim_{x \to 1} \int_4^{f(x)} \frac{2t}{x - 1} dt$ का मान ज्ञात कीजिए।

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

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