Differentiate w.r.t. b
-\frac{2}{3b^{\frac{5}{3}}}
Evaluate
\frac{1}{b^{\frac{2}{3}}}
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-\frac{2}{3}b^{-\frac{2}{3}-1}
The derivative of ax^{n} is nax^{n-1}.
-\frac{2}{3}b^{-\frac{5}{3}}
Subtract 1 from -\frac{2}{3}.
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