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2.30.2  Rational function given by roots and poles : fcoeff

fcoeff has as argument a vector whose components are the roots and poles of a rational function F[x], each one followed by it’s multiplicity.
fcoeff returns the rational function F(x).
Input :

fcoeff([1,2,0,3,2,-1])

Output :

(x-1)^2*x^3/(x-2)

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