integral by reduction of x(cosx)^n

[chingpokstreet]

I can find integral examples of (cosx)^n and xcosx, but i have no clue how to start x(cosx)^n .

any advice?

 

[stapel]

I can find integral examples of (cosx)^n and xcosx, but i have no clue how to start x(cosx)^n .

any advice?

Um... My advice would probably be to check your work (or the original exercise), because I sincerely doubt that you're intended to do the posted integration. Check out what Wolfram Alpha returns as its result. :shock: