2016-05-11

[public] 152K views, 1.86K likes, 21.0 dislikes audio only

3Blue1Brown

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/multivariable-calculus/multivariable-derivatives/partial-derivatives/v/symmetry-of-second-partial-derivatives

There are many ways to take a "second partial derivative", but some of them secretly turn out to be the same thing.

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