The Fourier series & rotating vectors in action (with i lurking) — more on the mathematical fabric of reality 

The Fourier series is a powerful technique that can be used to break down any repeating waveform into sinusoidal components, based on integer number harmonics of a fundamental frequency:Video:https://www.youtube.com/watch?v=ds0cmAV-Yek

Source: The Fourier series & rotating vectors in action (with i lurking) — more on the mathematical fabric of reality | Uncommon Descent

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