I am trying to learn 3D. In many 3D tutorials, I see sin(x), cos(x) and tan(x). I realise these are mathematical formulas, but can anyone tell me what they acctually do? The Manual tells me nothing. And don't say I shuld have learnt this on school, I havent encountered it yet, and I am (thanks to GM and computer programing) way in front of my class regarding math.