समाकल $I = \int \frac{dx}{(1 + e^x)(1 + e^{-x})}$ का मान क्या है?

  • A
    $\frac{-1}{1 + e^x}$
  • B
    $\frac{e^x}{1 + e^x}$
  • C
    $\frac{1}{1 + e^x}$
  • D
    इनमें से कोई नहीं

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