I have been out of school and working for 17 years now. I cannot remember anything I learned about trigonometry, algebra or geometry (which I think is as far as it went in those days) but I do find myself interested (more now than then) in mathematics.
Is there any good (preferably free) online material that I can reference? Being able to download and go through it in my own time would be most helpful. What would also be helpful is material that is fairly concise (i.e. not too drawn out).
Partly I would like to learn for my own personal interest, but as a programmer (albeit in a business environment) I think it can also help me in my job. Maybe you can also recommend a learning path, e.g. which branches of maths to study first.