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I got up to ∫∫[0 to 2pi] [0 to 2] cos(sqrt(r)) r dr dt

but I can't solve for it! How do integrate r*cos(sqrt(r))

\[\int\limits\int\limits_{D}=\int\limits_{0}^{2\pi} d\theta\ \int\limits_{0}^{2}r \cos rdr\]

omg you are correct.

spent literally 30 mins trying to see what I did wrong. That was quick thanks a lot man

yw

by the way:int( rcos r) it's done by integration by parts

can't I do substitution

you can try

haha I just did and it didn't work, alright thanks again!

if you have problems look here, :)
http://en.wikipedia.org/wiki/Integration_by_parts

there exacly you example

your*

Yeah I got it now, thanks a lot for your help!