From Trig to Sine Waves

On the long and arduous quest to Heisenberg's Uncertainty Principle, Sel and friends had to do a lot of learning, and they are sharing what they learned.
In this book, Sel, Herm and Carl share

– Equations, particularly the equation of a line
– How trig went from being about triangles to being about angles
– Radians, and why they're annoying and yet helpful
– The sine function
– The sine wave
– Amplitude