public static double method_tangent(double A, double B, double e, Polinom p)
{
double result;
Polinom d = p.Differential();
Polinom d2 = d.Differential();
if (p.ResultInPoint(A) * d.ResultInPoint(A) > 0)
{
result = A;
}
else
{
result = B;
}
do
{
result = result - p.ResultInPoint(result) / d.ResultInPoint(result);
}while (Math.Abs(p.ResultInPoint(result)) >= e);
return(result);
}