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2x\left(1-4x+4x^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(1-2x\right)^{2}.
2x-8x^{2}+8x^{3}
Use the distributive property to multiply 2x by 1-4x+4x^{2}.
2x\left(1-4x+4x^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(1-2x\right)^{2}.
2x-8x^{2}+8x^{3}
Use the distributive property to multiply 2x by 1-4x+4x^{2}.