Exactly where is your difficulty with #5?
There is a standard integration formula: .
And obviously, we let:
In the attached picture for #5 what would I use as u, since no term from the problem can be divided out of the original function...
And for #6 I have no idea what I would use as u either. Is there a method I can use to determine this easily in problems like this, because it seems like when people give me the first and second step I can do the rest easily.