Greetings, I have a question on superposition of two waves and I am pretty new to the topic. I am not contended with my solution and seek your evaluation. Any suggestion, comment is welcome. Thanks in advance. 1. The problem statement, all variables and given/known data Consider the superposition of two waves x1 = A1 cos(ω1t) and x2 = A2 cos(ω2t + δ). If ω1[itex]\cong[/itex] ω2, (a) What is the beat frequency? (b) What is the maximum amplitude? (c) What is the minimum amplitude? 2. Relevant equations Trigonometric identities for Product-to-sum and sum-to-product. 3. The attempt at a solution Attached to the post in jpeg format.