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(x3+x2-1)(x3-x2+1)
(x
3
+x
2
-1)(x
3
-x
2
+1)=
(x
3
+(x
2
-1)) (x
3
-(x
2
-1)) =
((x
3
)
2
-(x
2
-1)
2
) =
(x
6
-(x
4
-2x
2
+1)) =
x
6
-x
4
+2x
2
-1
