# A couple questions on integration

1. Feb 1, 2006

### antiflag403

Hey everyone,
I've been having a little trouble with a few HW questions. If you guys could point me in the direction (ie- help me find the method to solve) I would really appreciate it. The q's are:
1. The definite integral from 3 to 8 of- x^4(ln3x)dx
For this one I am not sure wether I should make a substitution of y=3x and then do integration by parts or if there is an easier method.
2. The indefinite integral of- 27x^2(cos(3x))
Again I think that a substitution may be necessary although I can't seem to figure out what it is.
Thanks to anyone who can help me out!!!
Thanks

2. Feb 1, 2006

### Tide

HINT: Try integration by parts. :)