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** monter:** Polynomials
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##

Factorize *x*^{n} 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 *x*^{n} (`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)

giac documentation written by Renée De Graeve and Bernard Parisse