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MrMuscle

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- TL;DR Summary
- Trying to solve the integral, for variational principle in griffith's book.

But I'm stuck at the final step. Can you please help?

Hi, I am trying to solve the problem in Griffith's book about variational principle. However, I am having trouble to solve the integral by myself that I have indicated in redbox in Griffith's book. You can see my effort in hand-written pages. I brought it to the final step I believe, but can't go further. A little bit help to finish the integration would do great! Thanks for your help in advance!