જો $\int \frac{dx}{(x \tan x + 1)^2} = f(x) + c$ હોય,તો $\lim_{x \rightarrow \frac{\pi}{2}} f(x) = $

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

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