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Coefficients of a polynomial defined by its roots : pcoeff pcoef

pcoeff (or pcoef) takes as argument a list of the roots of a polynomial P.
pcoeff (or pcoef) returns a univariate polynomial having these roots, represented as the list of it's coefficients by decreasing order.
Input :
Output :
i.e. (x - 1)(x - 2)(x2)(x - 3) = x5 - 6x4 + 11x3 - 6x2.

giac documentation written by Renée De Graeve and Bernard Parisse