[" Example "14.2" Which of the following "],[" functions of time represent (a) periodic and "],[" (b) non-periodic motion? Give the period for "],[" each case of periodic motion [ "omega" is any "],[" positive constant]."],[" (i) "sin omega t+cos2 omega t+sin4 omega t],[" (iii) "e^(-omega t)],[" (iv) "log(omega t)]