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1. (x+y+z).(x-y-z)
2. (x+y+z)^2
3. (x-y+z)^2
4. (x-y-z)^2
5. (a^2-2a+3).(a^2+2a-3)
6. (-a^2-2a+3).(-a^2-2a+3)
7. (x-y+x-t).(x-y-z+t)
8. (x+2y+3z+t)^3
9. (x^2+2x-1)^2
10. (x^2-2x-1)^2
11. (m^2+2m-3)^2
12. (x+1).(x^2+1).(x^4+1)
13. 2.(3+1).(3^2+1).(3^4+1)
2. (x+y+z)^2
3. (x-y+z)^2
4. (x-y-z)^2
5. (a^2-2a+3).(a^2+2a-3)
6. (-a^2-2a+3).(-a^2-2a+3)
7. (x-y+x-t).(x-y-z+t)
8. (x+2y+3z+t)^3
9. (x^2+2x-1)^2
10. (x^2-2x-1)^2
11. (m^2+2m-3)^2
12. (x+1).(x^2+1).(x^4+1)
13. 2.(3+1).(3^2+1).(3^4+1)