exo7 3189

Soient \(x_1,\dots,x_n\in\C\) distincts et \(y_1,\dots,y_n\in\C\). Trouver \(E = \{P\in\C[X]\text{ tq }\forall\ i,\ P^{-1}(\{y_i\}) = \{x_i\}\}\).