Euler’s unifying algebra, geometry, and analysis in one picture.
e^{ix} isn’t just an exponential; it’s a particle rotating at constant angular speed, writing cos(x) + i sin(x) in real time.
One equation. Three worlds unified:
• Geometry (unit circle)
• Trigonometry (sin/cos projections)
• Analysis (complex exponentials)
The green lines? :
cos(x) = (e^{ix} + e^{-ix})/2
sin(x) = (e^{ix} - e^{-ix})/(2i)
This single diagram is why Fourier transforms, quantum mechanics, signal processing, and electrical engineering all work.
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