History: The ______ oscillators use (1 / h), while the _____ oscillators use (1 / h^2).

The __ oscillators use (1 / h), while the _ oscillators use (1 / h^2).

• Square and rectangle; Triangle and sawtooth
  Sawtooths are a rich sound.
• Triangle and sawtooth; Square and rectangle
  Triangle waves have a gentle sound.
• Square, rectangle, and sawtooth; Triangle
  Yes, great work!
• Triangle, square, and rectangle; Sawtooth
  Sawtooths are a rich sound.