A helpful scientific calculator that runs in your web browser window.
Holt Online Learning
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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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This calculus integral reference sheet contains the definition of an integral and the following methods for approximating definite integrals: left hand rectangle, right hand rectangle, midpoint rule, trapezoid rule, and Simpson’s rule. There is a list of many common integrals. Also included in this reference sheet is nice table for trigonometric substation when using integrals. Integration by substitution is defined as well as the integration by parts.
eCacl.com
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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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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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