यदि ${I_n} = \int_0^{\pi /4} {{\tan ^n}\theta \,d\theta ,} $ है,तो किसी भी धनात्मक पूर्णांक $n$ के लिए,$n({I_{n - 1}} + {I_{n + 1}})$ का मान क्या है?

  • A
    $1$
  • B
    $2$
  • C
    $\frac{\pi }{4}$
  • D
    $\pi $

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