यदि $f(n) = \tan^{-1} \left( \frac{e-1}{e^{-n} + e^{n+1}} \right)$ सभी $n \in N$ के लिए है,तो $\sum_{n=1}^\infty f(n)$ का मान ज्ञात कीजिए।

  • A
    $\cot^{-1}(\frac{1}{e})$
  • B
    $\cot^{-1}(1)$
  • C
    $\tan^{-1}(\frac{2}{e})$
  • D
    $\tan^{-1}(\frac{1}{e})$

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