Input := wave2 = Cos[156 2 Pi t]
Output = Cos[312 Pi t]
Input := Plot[wave2, {t, 0, 0.1}, PlotPoints -> 50]
Output = -Graphics-
Input := Play[wave2, {t, 0, 1}]
Output = -Sound-
5b) the 156 Hz tone
5b) the 156 Hz tone
