Hello, Rob!

Your work looks good . . .

Now you should clearly state your answer.I have a compound angles question that I have attempted.

The question and my educated answer is laid out below:

Express in the form:

Now I have done the following after looking through books

and teaching myself so it may not be right!

. .

. .

Equating coefficients of gives: .

Equating coefficients of gives: .

. . Note that: .

Can anyone tell me if its right? . . Ya done good!

. .