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.

Let

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!