Problem 4 (25 points): ignore quantization error for this problem. Attach all your codes (a) [15 points) Use MATLAB to generate a 10 Hz sinusoidal signal and display it in analog form. In the same figure window, show how the discrete-time signal would look like after performing an the sampling rate to 50, 20, 15, 8, 5, 3 and 1 samples/sec. At each of these frequencies, analyze th plots and state whether there is aliasing or not. If there is aliasing, then what is the apparent quency of the digitized signal? Run your program multiple times for each frequency to see if analog-to-digital conversion (ADC) with a sampling rate of 100 samples/sec. Change anything changes and comment on that. (b) [10 points] Generate two signals, V - cos(2mfLt) and V2 cos(2nft)+0.5cos(2rf,t). With fi 10 Hz, fu 600 Hz and a sampling rate of F, 50 samples/sec, plot the digitized signals in the same figure window. Run the program a few times. Analyze the plots and state how the f Hz signal affects the digitized signal. Ignore any quantization error. Repeat the above with fH 40 Hz. Comment on the results and state the reasons