NbodyGradient.jl
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Factor out a squared term in this expression
https://github.com/ericagol/NbodyGradient.jl/blob/685014cfa11f9876c498d1e6e17b1be050ba4932/src/integrator/ahl21/ahl21.jl#L1238-L1240
Can write -\beta(G_2\eta+G_1r_0)^2
to simplify three terms.