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Visualizing Directional Derivatives and the Gradient
This video is intended to help understand what a directional derivative is, in a fashion similar to how the derivative is introduced in calculus (as the slope of a tangent line). The gradient vector then gives the direction to traverse the surface and obtain the optimal rate of increase and decrease.
![Div, Grad, and Curl: Vector Calculus Building Blocks for PDEs [Divergence, Gradient, and Curl]](https://i.ytimg.com/vi/lKXW7DRyyro/mqdefault.jpg)
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