$b > 3$ ની કઈ કિંમત માટે $12 \int \limits_{3}^{b} \frac{1}{(x^{2}-1)(x^{2}-4)} dx = \log _{e}(\frac{49}{40})$ થાય?

  • A
    $6$
  • B
    $3$
  • C
    $5$
  • D
    $9$

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