## An entire online text for Precalc from the Univeristy of Houston.

http://online.math.uh.edu/Math1330/index.html

It's the best free source I've seen. It's the project of grad students and is a comprehensive online text that has everything you'd expect from a textbook. And on top of that, there are streaming lectures.
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 University of Washington has a free precalc book too.
 Very short Trig course: http://www.clarku.edu/~djoyce/trig/

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