જો $\int_3^b \frac{x-1}{2x-x^2} dx = \frac{1}{2}$ હોય,તો $(b-1)^2 =$

  • A
    $2$
  • B
    $\sqrt{2}$
  • C
    $1+\frac{3}{e}$
  • D
    $\sqrt{\frac{3}{e}-1}$

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