यदि $n = 1, 2, 3, \ldots$ के लिए $I_n = \int_0^{\pi/4} \tan^n \theta \, d\theta$ है,तो $I_{n-1} + I_{n+1}$ का मान क्या होगा?

  • A
    $0$
  • B
    $1$
  • C
    $\frac{1}{n}$
  • D
    $\frac{1}{n+1}$

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