ધારો કે $f: R \rightarrow R$ એક વિકલનીય વિધેય છે અને $f(1)=4$ છે. તો $\lim _{x \rightarrow 1} \int_4^{f(x)} \frac{2 t}{x-1} dt$ ની કિંમત શોધો, જો $f^{\prime}(1)=2$ હોય.

  • A
    $16$
  • B
    $8$
  • C
    $4$
  • D
    $2$

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