http://www.sparknotes.com/math/index.html i've never tried this myself, but i've recommended to a few people and they've said it was pretty helpful.
just as an aside, trig isn't
that important to introductory calculus. it has enormous applications in everything (physics especially), but from a purely mathy standpoint you could easily dive into intro calc without knowing much beyond the identities involving trigonometric
functions (sin(x), cos(x), etc.). if you've got a solid base on algebra you needn't feel hesitant about trying out calculus.
linear algebra is another enormously useful topic that people look over or are unaware of entirely. i think that a lot of people could stand to learn some linear algebra before calculus, actually. again, algebra is the main prereq so you could dive in.