(4m-n)(4m+n) - +16m²-n², (ab-2)(ab+2) - a²b²-4, (3x+y)(3x-y) - 9x²-y², (5bc+3a)(5bc-3a) - 25b²c²-9a², (x³+y²)(x³-y²) - x9-y4, (2b+3)² - 4b²+9+12b, (y³-4x)² - y6+16x²-8xy³, (x-2)² - x²+4-4x,

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