(3x+2y)² - 9x²+12xy+4y², (2x+y).(2x+y) - (2x + y)² , (x-3y)² - x²-6y+9y², (5x + y)² - 25x²+10xy+y², (x -4y)² - x²-8xy+16y², (x-2).(x+2) - x²-4, (x-6).(x+6) - x²-36, (x-5).(x+5) - x²-25, (2x-1).(2x + 1) - 4x²-1, (3x-2).(3x+2) - 9x²-4, (5x-1).(5x + 1) - 25x²-1, (4a-3).(4a+3) - 16a²-9, (ab-c).(ab+c) - a²b²-c², (x-3y). (x + 3y) - x²-9y², (xy - z).(xy + z) - x²y²-z², (ab - 10). (ab + 10) - (ab)²-100, (3m - 4n). (3m + 4n) - 9m²-16n², (x+4).(x-4) - x²-16, x²-1 - (x+1).(x-1), (x+5)² - x²+10x+25, x²-4x+4 - (x-2)², (5x²-9y).(5x²+9y) - 25x⁴-81y² , 4x²-20xy+25y² - (2x-5y)², (4x-3y)² - 16x²-24xy+9y², 36x²-60xy+25y² - (6x-5y)², 4x⁴-4x²+1 - (2x²-1)², a⁴+6a²+9 - (a²+3)², (x-7).(x+7) - x²-49, (2x-y).(2x+y) - 4x²-y², (3xy-1).(3xy+1) - 9x²y²-1,

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