यदि ${I_n} = \int_0^{\pi /4} {{\tan ^n}\theta \,d\theta }$ है,तो ${I_8} + {I_6}$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{5}$
  • C
    $\frac{1}{6}$
  • D
    $\frac{1}{7}$

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