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Ejercicio 1.4
*Efectuar
1)
(x, y)
(2*x^2 - 3*y^2)^2
2)
a
(a^2 - 3)*(a^2 + 3)
3)
x
(x^2 + x - 1)*(x^2 + x + 1)
4)
(a, b, c)
(a - b + c)*(a + b + c)