$\int_{\log \frac{1}{2}}^{\log 2} \sin \left(\frac{e^x-1}{e^x+1}\right) d x=$

  • A
    $0$
  • B
    $1$
  • C
    $\cos \frac{1}{2}$
  • D
    $2 \log \frac{1}{2}$

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