Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.4 Directional Derivatives and Gradients, #6 · Multivariable Calculus · Gradient & optimization

… (point source at the origin)

Find grad f = (fx, fy, fz) for the functions from physics.

$1/ x^{2} + y^{2} + z^{2}$ (point source at the origin)

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.4 Directional Derivatives and Gradients, #6

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