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Questions on the calculus of variations, which deals with the optimization of functionals mostly defined on infinite dimensional spaces.

-6 votes

Prove/disprove $(\int_{0}^{2 \pi} \!\!\cos f(x) d x)^{2}+(\int_{0}^{2 \pi}\!\!\! \sqrt{(f'(x...

Don't trust me on this because I have never done calculus of variations (I'm still in high school), but I'm doing this just because I was bored. I also don't know how to insert special characters like …
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