Question

integral of 27x^2cos(3x)dx
if using integration by parts, is this correct:
let u=27x^2, du=54x dx
dv=cos(3x) dx, v=1/3sin(3x)

Answer 1

So your x will decrease in power, Hmm yah this looks like the right path to take :)
Have you tried it? :D
You'll end up integrating by parts 1 more time I think c:

Answer 2

yup i just finished it, and i integrated 2 times