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Los tres son diferencias de cuadrados. Responden al producto notable
(a^2 - b^2) = (a + b)(a - b)
36 - 16m4 = (6 + 4m^2)(6 - 4m^2)
16x2 - 9y2 = (4x + 3y)(4x - 3y)
m4 - n2 = (m^2 + n)(m^2 - n)