Consider an analog periodic sinusoid x(t)=cos (3*pi*t +pi/4) being sampled using a sampling period Ts to obtain a discrete time signal x(n)=x(t)|t=nTs = cos(3*oi*Ts*n+pi/4). Choose a value of Ts for which the discrete time signal is x(n) is not periodic with the appropiate lengh and Plot with Matlab, and explain under what conditions Ts makes the x(n) periodic.