The number of harmonic components in the oscillation represented by y - 4 cos2 2t sin 4t and their corresponding angular frequencies are:

y=4 cos2 2t sin 4t=21+cos 4tsin 4 t                           =2 sin 4t+2 sin 4 t cos 4 t                                  =2 sin 4t+sin 8 t Number of harmonic components = 2                       ω= 4 ras/s,8 rad/s.