Differentiate w.r.t. b
\frac{b^{2}}{243}
Evaluate
\frac{b^{3}}{729}
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\frac{\mathrm{d}}{\mathrm{d}b}(\frac{b^{3}}{729})
Calculate 9 to the power of 3 and get 729.
3\times \frac{1}{729}b^{3-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{243}b^{3-1}
Multiply 3 times \frac{1}{729}.
\frac{1}{243}b^{2}
Subtract 1 from 3.
\frac{b^{3}}{729}
Calculate 9 to the power of 3 and get 729.
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