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n^{2}-2nm+m^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-m\right)^{2}.
n^{2}-2nm+m^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-m\right)^{2}.