Math Help - Tangent of Curve Calculaton

Hi,

I have four X Points(x0,x1,x2,x3) and corresponding Y Points(y0,y1,y2,y3), A Curve can be connected using these points, I want to find tangent of this curve. How do I get this or what is method I suppose to use.


Thanks in Advance,

Pandi K

Tangent of Curve Calculaton