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  1. \documentclass{article}
  2. \usepackage{mathrsfs,amsmath}   %The amsmath package is included for \xrightarrow
  3. \begin{document}
  4. \begin{eqnarray*}
  5. B(\alpha) &=& \frac{2}{\pi} \int_0^{\infty} f(z) \sin \alpha z \text{\, d}z\\
  6.          &=& \frac{2}{\pi} \int_0^{\infty} 1. \sin \alpha z \text{\, d}z\\
  7.          &=& \frac{2}{\pi} \int_0^{\infty} e^{-sz} \sin \alpha z \text{\, d}z ; \quad s=0\\
  8.          &=& \frac{2}{\pi} \left[\mathscr{L}\{\sin \alpha z\}\right] ; \quad s=0\\
  9.          &=& \frac{2}{\pi}. \frac{\alpha}{\alpha^2+s^2}; \quad s=0\\
  10.          &=& \frac{2}{\pi}. \frac{\alpha}{\alpha^2}\\
  11.          &=& \frac{2}{\pi \alpha}
  12. \end{eqnarray*}
  13. \end{document}