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1+\left(n-1\right)^{3}
Calculate 1 to the power of 3 and get 1.
1+n^{3}-3n^{2}+3n-1
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(n-1\right)^{3}.
n^{3}-3n^{2}+3n
Subtract 1 from 1 to get 0.
1+\left(n-1\right)^{3}
Calculate 1 to the power of 3 and get 1.
1+n^{3}-3n^{2}+3n-1
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(n-1\right)^{3}.
n^{3}-3n^{2}+3n
Subtract 1 from 1 to get 0.