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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.4 Directional Derivatives and Gradients, #30 · Multivariable Calculus · Gradient & optimization

On a circle around the origin, distance is

On a circle around the origin, distance is $Δ s = r Δ θ$ . Then $d θ / d s = 1/ r$ . Verify by computing grad $θ$ and $T$ and $(grad θ) \cdot T$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.4 Directional Derivatives and Gradients, #30

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