I'm not sure about the Euler formula, but I can use trigonometry manipulation to write 2sin²5xcos3x as a sum of cosine terms.
How do I write
to a sum of cosine and/or sinusterms?
I should use Eulers formula, and control it by putting x=0 before and after I've done it.
Don't really know how to start, looked all the chapters in my book but still can't figure it out, think it's the ² term that makes me confused.