Cambridge covers that in the Year 12 3unit.
@ OP: Don't get too bogged up in textbooks. Trust me (a lot of other Year 12s and older will tell you this), past papers are the way to go.
Just get Fitzy and Cambridge, quickly go through it all and DON'T do every single damn question ==;;
After you've grasped the concept and done a few questions, grab some past papers from the resources part of this site/HSC past paper books and do them. They are much more useful than doing every extension question from Cambridge or whatever.