Evaluate
\frac{1}{4\sqrt[3]{xy}}
Differentiate w.r.t. x
-\frac{1}{12\sqrt[3]{y}x^{\frac{4}{3}}}
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64^{-\frac{1}{3}}x^{-\frac{1}{3}}y^{-\frac{1}{3}}
Expand \left(64xy\right)^{-\frac{1}{3}}.
\frac{1}{4}x^{-\frac{1}{3}}y^{-\frac{1}{3}}
Calculate 64 to the power of -\frac{1}{3} and get \frac{1}{4}.
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