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Ejercicio 1.3

*Efectue en cada caso

1)

var ('a,b')
(a, b)
(a^2-2*a*b+4*b^2) * (a+2*b)
(a + 2*b)*(a^2 - 2*a*b + 4*b^2)

2)

var ('a,b')
(a, b)
(a^4+a^3*b+a^2*b^2+a*b^3+b^4) * (a-b)
(a - b)*(a^4 + a^3*b + a^2*b^2 + a*b^3 + b^4)