Differentiate w.r.t. n
-21
Evaluate
-21n
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\frac{\mathrm{d}}{\mathrm{d}n}(-21n)
Combine -11n and -10n to get -21n.
-21n^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-21n^{0}
Subtract 1 from 1.
-21
For any term t except 0, t^{0}=1.
-21n
Combine -11n and -10n to get -21n.
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