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Geometric Meaning of the Gradient Vector

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Khan Academy Video 1 (Gradient vs. Directional Derivative) #khanacademytalentsearch

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Gradients and Partial Derivatives

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Level Curves and Traces of Multivariable Functions

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Understanding Lagrange Multipliers Visually

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Visualizing Circulation and Flux

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Gradient is perpendicular to the tangent plane

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The Gradient Operator in Vector Calculus: Directions of Fastest Change & the Directional Derivative