Directional Derivatives

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A helpful scientific calculator that runs in your web browser window.

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.

differentiation formulas

Definition of this method, f '(x) ~ (f(x+d) - f(x-d)) / (2d), for approximating derivatives and its advantages over the previous method.

Discussion of the potential problems with the first method for approximating derivatives.

Graphs of the types of discontinuities, including cusps, jump discontinuity, removable discontinuity, infinite discontinuity, and essential discontinuity.

Definition, including differentials and an applet for graphing a function and its derivative

Gives a definition and brief explanation of Directional Derivatives.