6. (4- 2x)(4 + 2x) 7. (3xy - abc)(3xy + abc)
8. (x2 + 4y2 )(x2 - 4y2 )
9. [2 + (x-1)][2 - (x - 1)]
10. [(x+2) -(y+1)][(x+2) + (y + 1)]
8. (x2 + 4y2 )(x2 - 4y2 )
9. [2 + (x-1)][2 - (x - 1)]
10. [(x+2) -(y+1)][(x+2) + (y + 1)]
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