Texas Instruments TI-84 - Manual (Page 195)

Chapter 8: Draw Instructions 192
Drawing Tangent Lines Drawing Tangent Lines Drawing Tangent Lines Drawing Tangent Lines
Drawing a Tangent Line Directly on a Graph Drawing a Tangent Line Directly on a Graph Drawing a Tangent Line Directly on a Graph Drawing a Tangent Line Directly on a Graph
To draw a tangent line when a graph is displayed, follow these steps.
1. Select 5:Tangent( from the DRAW menu.
2. Press
† and } to move the cursor to the function for which you want to draw the
tangent line. The current graph’s Y= function is displayed in the top-left corner, if
ExprOn is selected.
3. Press
~ and | or enter a number to select the point on the function at which you
want to draw the tangent line.
4. Press
Í. In
Func mode, the X value at which the tangent line was drawn is
displayed on the bottom of the screen, along with the equation of the tangent line. In
all other modes, the
dy/dx value is displayed.