## draw tangent

The line tangent to a curve at a particular point may be drawn while viewing
a graph by first pressing
to display TanLn, the tangent line function key.

Press to place
TanLn on the home screen.

Enter the expression in x (such as y1 or sin(x)) or press
to select the function from the list of previously stored functions.

The syntax is: Tangent( *expression*, *value* ).

*value* represents the x-coordinate of the point on the curve where the
tangent line is to be drawn.

Pressing will display the graph and draw the
tangent line.