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## Main Question or Discussion Point

hey, In my physics class we are now learinging beginging to learn about lagrange ion mechanics and im a little stuck on the basics of it particularly fermat's principle (dealing with light travel) and applications of the Euler-Lagrange Equation, I cant seem to get many of the problems at the end of the chapter, does any one know a web site or something that has a few worked out examples on how to do these?

thanks

thanks