(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

"Vary the following actions and write down the Euler-Lagrange equations of motion."

2. Relevant equations

[itex]S =\int dt q[/itex]

3. The attempt at a solution

Someone said there is a weird trick required to solve this but he couldn't remember. If you just vary normally you get [itex]\delta S=\int dt \delta q=0[/itex]

and thats not helpful. Any suggestion on how to avoid this problem?

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# Euler Lagrange Equation trough variation

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