Designed by Gerardo Mendoza and Dan Reich of Temple University, Calculus on the Web, better known as COW, is an "Internet utility for learning and practicing calculus." COW provides practice problems in an interactive format whereby users submit answers to find out if they are correct. "Hands on modules" allow students to "change values or parameters in a function or graph and then see the effect." This is an excellent educational resource for students and teachers seeking an additional approach to understanding calculus.
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