lammps/doc/Eqs/angle_class2.tex

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\documentclass[12pt]{article}
\begin{document}
\begin{eqnarray*}
E & = & E_a + E_{bb} + E_{ba} \\
E_a & = & K_2 (\theta - \theta_0)^2 + K_3 (\theta - \theta_0)^3 + K_4 (\theta - \theta_0)^4 \\
E_{bb} & = & M (r_{ij} - r_1) (r_{jk} - r_2) \\
E_{ba} & = & N_1 (r_{ij} - r_1) (\theta - \theta_0) + N_2 (r_{jk} - r_2) (\theta - \theta_0)
\end{eqnarray*}
\end{document}