Prove Euler's Formula e^iz = cos(z) + isin(z) (ILIEKMATHPHYSICS)

[@afesfrytuykjhyj]

I'm pretty sure the definitions of cos z and sin z are based on the identity and this is just circular reasoning hence not being a valid proof. A taylor series proof is a much better way to prove this.

[@biscuit_6081]

Bro proved nothing 😭

[@saj_f0]

It is true for all real numbers but you need to prove it for Complex numbers.

[@chaosredefined3834]

@@saj_f0 Nah, this proof is valid for all complex numbers. The problem is, he began with a definition that gets us to the outcome pretty quickly.

[@acuriousmind6217]

Just plug it in the exp(x) power series lil bro

[@justyours8766]

Who let this third grader on RUclips and make math videos?
Bro this is a circular argument....