# Directional Derivatives

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