A beautiful result in calculus: Solution using Feynman integration ( Integral cos(x)/(x^2+1) )

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Leibniz integral rule: https://www.youtube.com/watch?v=wkh1Y7R1sOw
Dirichlet 1: https://www.youtube.com/watch?v=YhPHe5222Fo
Dirichlet 2: https://www.youtube.com/watch?v=xWlchgxbQwk
Dirichlet 3: https://www.youtube.com/watch?v=ggFYBssFTkU

Haha 😀 Quite some tounge slipperinos in this video XD Especially in the end, it’s meant to be ,,Patreon” not,,video” 😀
Nvm, I hope you guys are enjoying this great technique of solving this integral using feynman integration 🙂 Turning an integral into a second order ordinary homogeneous differential equation is such a nice way of aproaching a problem!!! 🙂

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