A seven-scene guided mini-lesson: a sin θ + b cos θ is secretly ONE wave, R sin(θ + α). Prev / Next drives the story (← → keys work too) — or press ▶ Play all.
compound angle:R sin(θ + α) =
(R cos α) sin θ +
(R sin α) cos θ
match coefficients:R cos α = 3
and
R sin α = 4— the two legs