public Point Task3(Form form, Point location, double[] x, double[] y, double delta)
{
double[] xs = Range.Make(x.First(), x.Last(), delta);
double[] poly2 = Poly.Fit(x, y, 2);
double[] ys2 = Poly.Val(poly2, xs);
double[] poly3 = Poly.Fit(x, y, 3);
double[] ys3 = Poly.Val(poly3, xs);
Plot plot = new Plot();
plot.PlotSignalXY(x, y);
plot.PlotSignalXY(xs, ys2);
plot.PlotSignalXY(xs, ys3);
return(plot.AddToForm(form, location));
}