$\int \frac{1}{(e^x + e^{-x})^2} \, dx = $

  • A
    $-\frac{1}{2(e^{2x} + 1)} + c$
  • B
    $\frac{1}{2(e^{2x} + 1)} + c$
  • C
    $-\frac{1}{e^{2x} + 1} + c$
  • D
    इनमें से कोई नहीं

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