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(x^2-2x)^2-2x(2-x)+1
=[x(x-2)]^2 +2x(x-2) +1
=[ x(x-2) +1]^2
=(x^2-2x+1)^2
=[(x-1)^2 ]^2
=(x-1)^4
=[x(x-2)]^2 +2x(x-2) +1
=[ x(x-2) +1]^2
=(x^2-2x+1)^2
=[(x-1)^2 ]^2
=(x-1)^4
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