Hi all,

Would appreciate it if someone could show the explicit steps on how the second underlined term was derived from the first term underlined.

When I was following through with it, I ended up with the last term being

2 \cos(\alpha t) \sin(\alpha t) \langle Y \rangle _0 and not

-2 \cos(\alpha t) \sin(\alpha t) \langle Y \rangle _0

The rest of the work makes sense, it’s just the simplification of this term which I’m confused about. Below are the explicit steps which I’ve followed to simplify the first underlined term.

Thanks!

-Pavan