समाकलन $\int \frac{d x}{\left(e^x+e^{-x}\right)^2}$ का मान क्या है?

  • A
    $\frac{1}{2}\left(e^{2 x}+1\right)+C$
  • B
    $\frac{1}{2}\left(e^{-2 x}+1\right)+C$
  • C
    $-\frac{1}{2}\left(e^{2 x}+1\right)^{-1}+C$
  • D
    $\frac{1}{4}\left(e^{2 x}-1\right)+C$

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