જો $729 \int_1^3 \frac{1}{x^3(x^2+9)^2} dx = a + \log b$ હોય,તો $a - b =$

  • A
    $4$
  • B
    $-\frac{4}{5}$
  • C
    $\frac{4}{5}$
  • D
    $-4$

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