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4x^{2}-4x+1-1^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
4x^{2}-4x+1-1
Calculate 1 to the power of 2 and get 1.
4x^{2}-4x
Subtract 1 from 1 to get 0.
4x^{2}-4x+1-1^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-1\right)^{2}.
4x^{2}-4x+1-1
Calculate 1 to the power of 2 and get 1.
4x^{2}-4x
Subtract 1 from 1 to get 0.