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