Cauchy’s formula for repeated integration. I worked it out "backwards" from DI method. We can also do the similar thing to show the Laplace transform formula. See this video by Mu Prime Math Here are the winners: Here's the DI hoodie: If you enjoy my videos, then you can click here to subscribe Wiki My math T-shirts & hoodies: Site: twitter: Instagram: Patreon: Blue Microphone: blackpenredpen math for fun