यदि $\int_0^{\pi / 2} \tan ^{14}\left(\frac{x}{2}\right) d x=2\left[\sum_{n=1}^7 f(n)-\frac{\pi}{4}\right]$ है, तो $f(n)=$

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

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