मान लीजिए $f(x) = \int\limits_1^x \frac{\tan^{-1} t}{t} dt$ जहाँ $x > 0$ है। तो $f(e^2) - f\left(\frac{1}{e^2}\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{2}$
  • B
    $\pi$
  • C
    $2\pi$
  • D
    $\frac{\pi}{4}$

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