(x²-2xy+y²) - m²
(x-y)² - m²
[(x-y)+m][(x-y)-m]
(x-y+m)(x-y-m)
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(x²-2xy+y²) - m²
(x-y)² - m²
[(x-y)+m][(x-y)-m]
(x-y+m)(x-y-m)