Nope. They're both there.
Overrated theorems
Caleb Russell
James Kelly
It's not "defined" as a sine wave. It's emergent. It shows up when you expand sin(ix) as a Taylor series.
Levi Jenkins
Fuck, you're right, I'm a brainless and sorry for writing this.
Thought there was an i missing in the exponent at first.
Josiah Mitchell
Sorry, I was confused. It is the opposite, it appears in the series of e^(ix).