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

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

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