1) (a+b)(a-b+1)
2) (3a-b+4)(3a-b-4)
3) x(x-1)(xy-1)
4) (1-2y+x)(1+2y+x)
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Answers & Comments
1) (a+b)(a-b+1)
2) (3a-b+4)(3a-b-4)
3) x(x-1)(xy-1)
4) (1-2y+x)(1+2y+x)