Equation of Tangent

[vjc]

Thanks Road,
That works flawlessly. Perfect solution for something missing inherently in Prime.
I don't know why is it missing in Prime whereas both Casio and TI calculators display the equation of Tangent right on the screen where the Tangent is drawn.
You made it work. That was an elaborate and long program you wrote, must have taken a lot of your time and effort, many thanks once again.