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I am trying to follow a derivation of the euler lagrange equations in one of my textbooks. It says that

[tex]\int ( f\frac{dL}{dx} + f'\frac{dL}{dx'}) dt[/tex]

=

[tex]f\frac{dL}{dx'} + \int f ( \frac{dL}{dx} - \frac{d}{dt}(\frac{dL}{dx'}) ) dt [/tex]

where f is an arbitrary function and L is the Lagrangian.

I'm not sure how to perform this step. I think it has something to do with integration by parts but can't work it out. Any help would be appreciated.

Thanks

teeeeee

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# Help with derivation of euler-lagrange equations

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