Find the spectrum of the following harmonic vibrations: 1) S1(t) = acos2w0t; 2) S2(t) = a(1 + mcosWt)cosw0t; 3) S3(t) = acos(w0t + mcosWt) for m 1. Give a graphical representation of the spectral decompositions. Compare the vibration spectra of S2 and S3. What is their difference? (When expanding into the spectrum of vibration S3, terms of order m2 and higher are neglected.)

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