Euler's Formula
# Statement
Suppose $r, \theta \in \mathbb{R}$ so that $r \geq 0$. Then $$re^{it \theta} = r \cos \theta + i r \sin \theta$$
# Proof
TODO but basic idea is to apply the Taylor Expansions of the terms.
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Suppose $r, \theta \in \mathbb{R}$ so that $r \geq 0$. Then $$re^{it \theta} = r \cos \theta + i r \sin \theta$$
TODO but basic idea is to apply the Taylor Expansions of the terms.