Evaluate
\frac{\left(2n-1\right)^{2}}{4}
Expand
n^{2}-n+\frac{1}{4}
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n^{2}-n+\frac{1}{4}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-\frac{1}{2}\right)^{2}.
n^{2}-n+\frac{1}{4}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-\frac{1}{2}\right)^{2}.
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