(a) Use Excel to generate a series of y' values from the equation, with 1 yt) [cos( f2t) cos(fit)] fi - $2 f1 = 8 f2 = 1, and t between 0 to 20. Please select a proper step of t, so as to have enough points to obtain an accurate plot. (b) Then, save your data in a format of 'xlsx', and 'txt files. (c) Next, use Matlab to load your saved files. (d) Use Matlab to generate the same series of y values with proper step to obtain accurate plot. (e) Use Matlab 'subplot to plot the three curves from 'xlsx', "txt', and 'Matlab' with red, blue and black colors respectively. (a) Use Excel to generate a series of y' values from the equation, with 1 yt) [cos( f2t) cos(fit)] fi - $2 f1 = 8 f2 = 1, and t between 0 to 20. Please select a proper step of t, so as to have enough points to obtain an accurate plot. (b) Then, save your data in a format of 'xlsx', and 'txt files. (c) Next, use Matlab to load your saved files. (d) Use Matlab to generate the same series of y values with proper step to obtain accurate plot. (e) Use Matlab 'subplot to plot the three curves from 'xlsx', "txt', and 'Matlab' with red, blue and black colors respectively