1 line
210 B
TeX
1 line
210 B
TeX
\delta S=\left[\frac{\partial L}{\partial \dot{q}}\delta q\right]_{t_1}^{t_2}+\int_{t_1}^{t_2}\left(\frac{\partial L}{\partial q}-\frac{\dd{}}{\dd{t}}\frac{\partial L}{\partial \dot{q}}\right)\delta q \dd{t}=0
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