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Caso.
Diferencia de cuadrados.
Aplicas.
a² - b² = (a + b)(a - b)
x⁴ - y⁴ =
(x²)² - (y²)² =
(x² + y²)(x² - y²) = El en 2do parentesis vuelves aplicar diferencia
de cuadrados
(x² + y²)(x + y)(x - y)
Respuesta.
(x² + y²)(x + y)(x - y)
= (x^2 + y ^2)(x^2 - y^2)
= (x^2 + y^2)(x + y)(x - y)