Create a curve through a sequence of points with tangent constraints at the first and last point.

Input parameters:

1. Pt → Sequence of points for the curve.
2. Dg → Curve degree.
3. Ta → Tangent constraint at the start of the curve.
4. Tb → Tangent constraint at the end of the curve.

Output parameters:

1. Cr → Curve defined by end tangents and a sequence of points.