Determine the Fourier series representations for the following signals. You shall not only give the Fourier series coefficients, but also give the Fourier series expression of the signals. (a) Each x[n] or x(t) illustrated in Figure 1. (b) x(t) periodic with period 2 and x(t)=etfor1t1. (c) x(t) periodic with period 4 and x(t)={sin(t),0,0t2,2