What's the proof of the Euler-Lagrange requirement for minimising an integral?

What's the proof of the Euler-Lagrange requirement for minimising an integral?

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

http://upload.wikimedia.org/math/f/6/e/f6ee48b778d912689720cd77e1f4a0b3.png
This is true??

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

Looking for something else?

Not the answer you are looking for? Search for more explanations.