2016-05-24
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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-of-vector-valued-functions/v/partial-derivative-of-a-parametric-surface-part-2
Taking the same example surface used in the last example, we now take a look at the partial derivative in the other direction.