Differentiate w.r.t. h
2h^{3}
Evaluate
\frac{h^{4}}{2}
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4\times \frac{1}{2}h^{4-1}
The derivative of ax^{n} is nax^{n-1}.
2h^{4-1}
Multiply 4 times \frac{1}{2}.
2h^{3}
Subtract 1 from 4.
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