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"Wolfram Alpha is on a mission to develop an "app for every course." The company launched its first three subject-specific iPhone apps on Tuesday, and all three - Algebra, Calculus, and Music Theory - look to be promising educational tools"

"The mathematics tutorials are videos featuring mathematics teachers explaining and demonstrating how to solve mathematics problems. There are tutorial videos covering Algebra, Geometry, Trigonometry, and Calculus." (summary from Free Technology for Teachers blog)