Exercício 4.2 com Newton

> X:=vector(5,[2,2.2,2.4,2.6,2.8]);
fX:= vector(5,[0.510373,0.520789,0.510423,0.481345,0.435912]);
PoliNewton(X,fX,15);
p4xLagrange := -.3079246285*x^2-.2563524621e-1*x^3+.7473942384e-2*x^4-.9869927312+1.407281568*x;