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Lagrangian of a driven pendulum (Landau problem)
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[QUOTE="TSny, post: 6129468, member: 229090"] Such terms do not affect the equations of motion (i.e., the Euler-Lagrange equations given by equation (2.6) in Landau on page 3). Any two Lagrangians that differ only by such terms, will produce the same equations of motion. So, you can neglect such terms in the Lagrangian when deriving the equations of motion. It should be fairly clear by inspection of the Euler-Lagrange equations that terms in the Lagrangian that are either constant or depend only on time will not affect the equations of motion. As far as terms that are total derivatives, see Landau's explanation on page 4 in the last paragraph before section 3. [/QUOTE]
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Lagrangian of a driven pendulum (Landau problem)
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