I've got my key stage 3's next week and I've just found out today that I'm being put in for the hardest maths paper. I also found out that I need to have an advanced understanding of trigonometry, but I haven't the faintest what trigonometry is. I know Pythagoras theorm and stuff like that, it's just things like sine, etc. that I don't know. If someone could post some help, or even post a link to where I could get help, I'd really appreciate it.