Answer
-x$^4$+x$^2$-2x+1
Work Step by Step
(A+B)(A-B)=A$^2$-B$^2$
((x-1)+x$^2$)((x-1)-x$^2$)
(x-1)$^2$-(x$^2$)$^2$
(x$^2$-2x+1)-x$^4$
-x$^4$+x$^2$-2x+1
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