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2.24.9  Factorize xn in a polynomial : factor_xn

factor_xn takes as argument a polynomial P.
factor_xn returns the polynomial P written as the product of it’s monomial of largest degree xn (n=degree(P)) with a rational fraction having a non-zero finite limit at infinity.
Input :

factor_xn(-x^4+3)

Output :

x^4*(-1+3*x^-4)

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