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