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Aplicas.
Diferencia de Cuadrados.
a² - b² = (a + b)(a - b)
(x² + 1)² - (x² - 1)² =
(x² + 1 + (x² - 1))(x² + 1 - ( x² - 1) =
(x² + 1 + x² - 1)(x² + 1 - x² + 1) =
(2x²)(2) =
4x²
Respuesta.
4x²