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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differentiation formulas
StudyStack
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Definition of this method, f '(x) ~ (f(x+d) - f(x-d)) / (2d), for approximating derivatives and its advantages over the previous method.
MIT
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Discussion of the potential problems with the first method for approximating derivatives.
MIT
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Graphs of the types of discontinuities, including cusps, jump discontinuity, removable discontinuity, infinite discontinuity, and essential discontinuity.
MIT
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Definition, including differentials and an applet for graphing a function and its derivative
MIT
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Gives a definition and brief explanation of Directional Derivatives.
Math World Wolfram
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