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