Superposition of Two Waves

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.

Homework Statement

Consider the superposition of two waves x1 = A1 cos(ω1t) and x2 =
A2 cos(ω2t + δ). If ω1$\cong$ ω2,
(a) What is the beat frequency?
(b) What is the maximum amplitude?
(c) What is the minimum amplitude?

Homework Equations

Trigonometric identities for Product-to-sum and sum-to-product.

The Attempt at a Solution

Attached to the post in jpeg format.

Attachments

• SWScan00001.jpg
14.2 KB · Views: 362