A lesser-known (but extremely useful) integration trickpic.twitter.com/20Qgs8QeNk
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Ah... Naturally haha to be more of a pest, it holds for "all" functions? It's times like these I realise I should use mathematics as the playground I first did, as well as the tool in my day to day work. I suppose I'm not alone in not toying with things anymore 
it holds for any f(x) you can integrate over the domain
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