Differentiate w.r.t. b
\frac{21b^{2}}{2}
Evaluate
\frac{7b^{3}}{2}
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3\times \frac{7}{2}b^{3-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{21}{2}b^{3-1}
Multiply 3 times \frac{7}{2}.
\frac{21}{2}b^{2}
Subtract 1 from 3.
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