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Mathematics 18 Online
OpenStudy (anonymous):

\[\let f(x,y,z) = \frac{ xyz }{ x^{4} + y ^{4} + z ^{4} } and f(0,0,0) = 0. Show that D_{x}f, D_{y}f and D_{z}f all exist everywhere. Find the points for which Df \exists.\]

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