Differentiate w.r.t. w
21w
Evaluate
\frac{21w^{2}}{2}
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2\times \frac{21}{2}w^{2-1}
The derivative of ax^{n} is nax^{n-1}.
21w^{2-1}
Multiply 2 times \frac{21}{2}.
21w^{1}
Subtract 1 from 2.
21w
For any term t, t^{1}=t.
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