A student writes four different expressions for the displacement x in a periodic motion as a function of time t, A as amplitude, T as time period. Which of the following can be correct? (1) x= AT sin 2.pi.t/T (2) x= A.A Tcost (3) x= A/Tcost/a (4) x= A/2power1/2[sin2pi t/T +cos2pi t/T

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