III. Working With A Graph
B. MATH
11. TANLN (tangent line)
You can have your calculator draw a tangent line at a specified point on a graph. When the line is drawn the value of the derivative is shown. However, the equation of the tangent line is not given and the line cannot be analyzed or used in any way.
Example: Draw a tangent line to the graph at x=2.
Enter the
function. 
Graph using
ZDECM. 
DIST:

You will see
this screen. 
Enter x=2.

Tangent line
is drawn. 