'Above theorem' presentation slideshows

Directional Derivatives and the Gradient Vector

Directional Derivatives and the Gradient Vector. Recall that if f ( x , y ) is a function of two variables, then ? f / ? x at a point ( a , b ) is the slope of the graph of f in the x direction at the point ( a , b ). And similarly, ? f / ? y is the slope in the y direction.

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