Differentiate w.r.t. n
-\frac{16}{n^{3}}
Evaluate
\frac{8}{n^{2}}
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-2\times 8n^{-2-1}
The derivative of ax^{n} is nax^{n-1}.
-16n^{-2-1}
Multiply -2 times 8.
-16n^{-3}
Subtract 1 from -2.
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