Factor
\frac{\left(n-2\left(-\frac{1}{2}\right)^{n}\right)\left(n+2\left(-\frac{1}{2}\right)^{n}\right)}{4}
Evaluate
-\left(-\frac{1}{2}\right)^{2n}+\frac{n^{2}}{4}
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\frac{n^{2}+2\left(-\frac{1}{2}\right)^{2n-1}}{4}
Factor out \frac{1}{4}.
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