Consider the signals of Figure P4.11(a) and (d).
(a) Change the period of x0(t) to T0=4. Use Table 4.3 to find the Fourier coefficients of the exponential form for this signal.
(b) Use Table 4.3 to find the Fourier coefficients of the exponential form for xd(t).
(c) Consider the signal
where Xa(t) is defined in part (a). By inspection of Figure P4.11(a) and (d), find a1, b1 and T such that x(t) is constant for all time; that is, x(t) = A, where A is a constant. In addition, evaluate A.
(d) Use the results of parts (a) and (b) to show that all the Fourier coefficients of x(t) in part (c) are zero except for C0=A.
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