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Paid iPad app: http://itunes.apple.com/app/wolfram-multivariable-calculus/id428100167?mt=8&uo=4&at=10l6SU
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Edmodo app: http://www.edmodo.com/publisher/schooltube
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Free Android Phone app: https://play.google.com/store/apps/details?id=org.ck12.app.practice
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