I asked this question in here:(adsbygoogle = window.adsbygoogle || []).push({});

https://nrich.maths.org/discus/messages/7601/151442.html?1310911861 [Broken]

(post 4), and still haven't got any reply, does someone know how to get to [tex]g'(\epsilon)[/tex] in the text cause I get something different with another terms plus the terms in the text.

I guess i'll need to procceed without understanding how did he get the LHS fo g'.

)-:

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# Variational Calculus question.

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