# Directional Derivatives

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 A helpful scientific calculator that runs in your web browser window. Holt Online Learning Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra. Paul's Online Math Notes differentiation formulas StudyStack Definition of this method, f '(x) ~ (f(x+d) - f(x-d)) / (2d), for approximating derivatives and its advantages over the previous method. MIT Discussion of the potential problems with the first method for approximating derivatives. MIT Definition of this basic method for approximating the derivative of a function with f'(x) ~ (f(x+d) - f(x)) / d. MIT Graphs of the types of discontinuities, including cusps, jump discontinuity, removable discontinuity, infinite discontinuity, and essential discontinuity. MIT Definition, including differentials and an applet for graphing a function and its derivative MIT Can graph, move, and adjust the directional derivative in an interactive java application on the page. Great for helping to solve problems. MIT Gives a definition and brief explanation of Directional Derivatives. Math World Wolfram
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