यदि $\int e^{-x} \tan ^{-1}\left(e^x\right) d x = f(x) - \frac{1}{2} \log \left(1+e^{2 x}\right) + C$ है, तो $f(x)$ का मान क्या है?

  • A
    $e^x - e^{-x} \tan ^{-1}\left(e^x\right)$
  • B
    $x^2 + e^{-x} \tan ^{-1}\left(e^x\right)$
  • C
    $-e^{-x} \tan ^{-1}\left(e^x\right)$
  • D
    $x - e^{-x} \tan ^{-1}\left(e^x\right)$

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