Differentiate w.r.t. n
-\frac{1}{27n^{2}}
Evaluate
\frac{1}{27n}
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-\frac{1}{27}n^{-1-1}
The derivative of ax^{n} is nax^{n-1}.
-\frac{1}{27}n^{-2}
Subtract 1 from -1.
\frac{1}{27n}
Multiply \frac{1}{27} times \frac{1}{n} by multiplying numerator times numerator and denominator times denominator.
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