P-7.8 The frequency response of an LTI system is H(ej) = cos(3@). Determine the output of the system x1 [n] = 8[n 3] Octave: Create a scriptfile that plots the frequency-response H(el), given in problem P-7.8, over the interval @ = (-1, 1] using the command w = linspace (-pi, pi, 1024) to create the array