Question

Have I solved it right? Does it need any further simplification? If yes, I would be extremely grateful if you show me how to :)

Answer 1

yes i think this is perfectly done your simplification is right...

Answer 2

Yep, it's perfectly done and as far as simplification is concerned, you're brought it as far as necessary. In this final answer maybe just group the cosine terms together as well. Other than that it's a perfect answer.