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9x² - 1
Lim ----------- = Factorizas diferencia de cuadrados
x->1/3 3x - 1 a² - b² = (a + b)(a - b)
(3x + 1)(3x - 1)
Lim --------------------- = Simplificas 3x - 1
x-> 1/3 (3x - 1)
Lim 3x + 1 = 3(1/3) + 1 = 1 + 1 = 2
x-> 1/3
Respuesta.
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