btw did you know that: (1-tg x) / (1+ tg x) = 2*cos 2x
Think about it <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
And when you're done with it, think about this one : e^(i pi) = -1
It was my math teacher's favourite <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
And thanks to MeaCulpa for remembering my birthday <img src="/ubbthreads/images/graemlins/party.gif" alt="" />
