Simplify : simp2

simp2 takes as argument two polynomials (or two integers see 1.8.6). These two polynomials are seen as the numerator and denominator of a rational fraction.
simp2 returns a list of two polynomials seen as the numerator and denominator of an irreducible representant of this rational fraction.
Input :

simp2(x^3-1,x^2-1)

Output :

[x^2+x+1,x+1]