Waveform

The waveform and a definition of the fundamental period. Note: there's a small typo at 5:50: the text should read T=0.08s (matching the voice-over) rather than T=0.8s.
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Excellent 110
Very helpful 16
Quite helpful 13
Slightly helpful 13
Confusing 0
No rating 0
My brain hurts 0
Really quite difficult 0
Getting harder 2
Just right 73
Pretty simple 77
No rating 0