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4n^{2}-4n+1
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(2n-1\right)^{2}.
4n^{2}-4n+1
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(2n-1\right)^{2}.