જો ${u_n} = \int_0^{\pi /4} {{\tan ^n}x\,dx,} $ હોય,તો ${u_n} + {u_{n - 2}} = $

  • A
    $\frac{1}{{n - 1}}$
  • B
    $\frac{1}{{n + 1}}$
  • C
    $\frac{1}{{2n - 1}}$
  • D
    $\frac{1}{{2n + 1}}$

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