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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}