જો $b = \int_{0}^{1} \frac{e^{t}}{t+1} dt$ હોય,તો $\int_{a-1}^{a} \frac{e^{-t}}{t-a-1} dt$ ની કિંમત શોધો.

  • A
    $be^{a}$
  • B
    $be^{-a}$
  • C
    $-be^{-a}$
  • D
    $-be^{a}$

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