જો $I_n = \int_0^{\pi / 4} \tan^n x \, dx$ હોય,તો $\frac{1}{I_2 + I_4} + \frac{1}{I_3 + I_5} + \frac{1}{I_4 + I_6} = $

  • A
    $\frac{1}{I_9 + I_{11}}$
  • B
    $\frac{1}{I_{10} + I_{12}}$
  • C
    $\frac{1}{I_{12} + I_{14}}$
  • D
    $\frac{1}{I_{11} + I_{13}}$

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