Move point A along the graph. What IS point B tracing?[br][br]Edit by changing [math]f[/math] to [math]f\left(x\right)=cosx[/math]. Do you recognize the function in blue? (Hint: Adjust the viewing window.)[br][br]Experiment with other functions.

Drag point F. What do you notice? Use a GeoGebra tool to confirm your observation.