Differentiate(
     double t,
     out double first,
     out double second
     )
 {
     return(_barycentric.Differentiate(t, out first, out second));
 }
 Differentiate(
     double t,
     out double first,
     out double second
     )
 {
     return(_barycentric.Differentiate((t + _transformSummand) * _transformFactor, out first, out second));
 }