Consider a sampling frequency of 60 Hz for a signal: x(t) = 7 sin(25t) + 2 cos(215t) Plot the analog signal x(t) for 0 t 2s. Plot the digital signal x(n) with the appropriate time index n. Plot the one-sided amplitude spectrum. Plot the one-sided power spectrum. Add white Gaussian noise to the signal using awgn() function in MATLAB. Plot the analog signal x(t) and digital signal x(n) with the white Gaussian noise. Plot the one-sided amplitude spectrum. Plot the one-sided power spectrum. What do you observe in the plots in part (g) and (h) compare to the plots in (c) and (d) without noise? all in matlab