This is just an application of the quotient rule:
I'll leave it to you to tidy it up!
The second one follows directly from the first. Remember that . Did I write this in your other thread?
The final one is much easier to just solve:
From here it can be split up:
The first integral is easy, the second one is harder.
There's probably an easier of doing it that that, this method was just the first one I thought of.
Good luck in your finals!