A helpful scientific calculator that runs in your web browser window.
Holt Online Learning
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Gives a detailed explanation on working with multiple integrals and how to change the variables in order to solve them.
Math Pages
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Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes
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Definition and Examples of Multiple Integrals.
Harvey Mudd College
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Problems with full explanation of how to ocmplete problems with changes in variables in multiple integrals.
University of Maryland
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Definiton of a Multiple Integral
Wolfram - Math World
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