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Irving Garcia on 18 Mar 10Students in Precalculus class would find this website very useful. It has some problems you practice with. Just follow this directions to find the precalculus book. Select: Demana: Precalculus: Graphical, Numerical, Algebraic, 7e Your textbook cover should appear. You can choose the chapter and section that you want to practice in. Chapters average around 80 practice problems. You can also print off problems and results.