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Free online videos help with algebra, trig and more

Brightstorm Math offers free help with algebra, geometry, trigonometry, precalculus and calculus. Over 2,00 online videos provide clear explanations of sometimes knotty concepts. Other services, available with a paid membership, include test preparation programs, such as SAT, ACT and Advanced Placement courses. The programs include include practice quizzes, downloadable materials, full-length practice exams and more.