$n \geq 2$ માટે,ધારો કે $I_n = \int_0^{\pi / 4} \tan^n x \, dx$ અને $F_n = I_n + I_{n-2}$ છે. તો,$F_n - F_{n+1} =$

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

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