this post was submitted on 18 Sep 2025
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I'd be curious how that works? I always hated memorizing those things, and I'd love it if there was some way to easily derive those from a single relationship.
e^(ix) = cos(x) + i sin(x)
That is the euler relationship. You can use that relationship to convert any expression with a trig function into an expression of exponentials and imaginary numbers. "Euler's formula" is a good search term if you want to learn more