Differentiate w.r.t. c
\frac{1}{9c^{\frac{8}{9}}}
Evaluate
\sqrt[9]{c}
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\frac{1}{9}c^{\frac{1}{9}-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{9}c^{-\frac{8}{9}}
Subtract 1 from \frac{1}{9}.
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