Comment by selecsosi

Guessing the original comment hasn't taken complex analysis or has some other oriented view point into geometry that gives them satisfaction but these expressions are one of the most incredible and useful tools in all of mathematics (IMO). Hadn't seen another comment reinforcing this so thank you for dropping these.

Cauchy path integration feels like a cheat code once you fully imbibe it.

Got me through many problems that involves seemingly impossible to memorize identities and re-derivation of complex relations become essentially trivial