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16a^{2}-32a+16
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4a-4\right)^{2}.
16a^{2}-32a+16
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4a-4\right)^{2}.