lammps/doc/Eqs/angle_cosine_shift_exp.tex

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$$
E=-Umin \frac{Exp(-a U(\theta,\theta_0))-1\right}{Exp(a)-1}\quad\mbox{with}\quad
U(\theta,\theta_0)=0.5 \left(-cos[\theta-\theta_0]-1 \right)
$$
\end{document}