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  • tutorial.math.lamar.edu (great for learning calculus and diff eq by examples)

  • math24.net (great resource for elementary methods for ODEs as well as advanced topics such as envelope and other singular solutions)

  • discrete.openmathbooks.org (open course in discrete math)

  • www.lakelandschools.org/lakelandhigh/academics/math.php (free online high school math textbooks)

  • math.stackexchange.com (forum)

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