Directional Derivatives
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Use the vector and point controls (arrows) in the top pane to adjust the location and angle of the direction vector on the surface.
Contributed by: Abby Brown (Torrey Pines High School) (March 2011)
Open content licensed under CC BY-NC-SA
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"Directional Derivatives"
http://demonstrations.wolfram.com/DirectionalDerivatives/
Wolfram Demonstrations Project
Published: March 7 2011