 4.6 Directional Derivatives and the Gradient (source code)

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= 4.6 Directional Derivatives and the Gradient
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Online text: https://openstax.org/books/calculus-volume-3/pages/4-6-directional-derivatives-and-the-gradient

Cited passages: Calculus Volume 3, Definition (4.36), the unit-direction convention, and Theorem 4.12 with the gradient formulation.

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