(1-x)³(x-1)²-(x-1)^4[-(1-x)]
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(1-x)³(x-1)²-(x-1)^4[-(1-x)]

=-(x-1)³(x-1)²+(x-1)^4(x-1)

=-(x-1)^5+(x-1)^5

=0;

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