I. Use Excel spreadsheet to write a program and plot two waves [cos and cos)] and their sum [cos(h) + cos(5)]. The frequencies of the waves are f -2nf and f 2f1.1, respectively. For simplicity, we assume-l. (40 points). 2. Use Excel spreadsheet to write a program and plot 3 waves [cos(fi) cos) and cos(fs)] and their sum [cosf) cos() cos(s)]. The frequencies of the waves aref-2. A2-2 1.1 and = 2n/x1.2, respectively. (40 points). 3. Describe and explain your observations of these wave packets in less than 200 words. (Be concise and right the point!) (20 points) I. Use Excel spreadsheet to write a program and plot two waves [cos and cos)] and their sum [cos(h) + cos(5)]. The frequencies of the waves are f -2nf and f 2f1.1, respectively. For simplicity, we assume-l. (40 points). 2. Use Excel spreadsheet to write a program and plot 3 waves [cos(fi) cos) and cos(fs)] and their sum [cosf) cos() cos(s)]. The frequencies of the waves aref-2. A2-2 1.1 and = 2n/x1.2, respectively. (40 points). 3. Describe and explain your observations of these wave packets in less than 200 words. (Be concise and right the point!) (20 points)