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##=======오일러-라그랑주_방정식,Euler-Lagrange_equation =,Euler-Lagrange_equation . 오일러-라그랑주_방정식 Euler-Lagrange_equation

$\frac{\partial L}{\partial x_i} - \frac{d}{dt}\left( \frac{\partial L}{\partial \dot{x_i}} \right) = 0,\;\; i=1,2,3.$

[[WtEn:Euler-Lagrange_equation]] = https://en.wiktionary.org/wiki/Euler-Lagrange_equation