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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.4 Directional Derivatives and Gradients, #29 · Multivariable Calculus · Gradient & optimization

Write down the level direction … for … at the point

Write down the level direction $u$ for $θ = tan^{- 1} (y / x)$ at the point $(3, 4)$ . Then compute grad $θ$ and check $D_{u} θ = 0$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.4 Directional Derivatives and Gradients, #29

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