Drawing Tangent Lines - Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book

Drawing Tangent Lines

Drawing a Tangent Line Directly on a Graph
To draw a tangent line when a graph is displayed, follow these steps.
1. Select from the
5:Tangent(
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
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
the bottom of the screen, along with the equation of the tangent line. In all other modes, the
value is displayed.
dy/dx
5. Change the fixed decimal setting on the mode screen if you want to see fewer digits displayed
for X and the equation for Y.
Drawing a Tangent Line from the Home Screen or a Program
(tangent line) draws a line tangent to
Tangent(
. X can be an expression.
X=value
menu.
DRAW
mode, the X value at which the tangent line was drawn is displayed on
expression
is interpreted as being in Func mode.
expression
ExprOn
in terms of X, such as Y1 or X
Chapter 8: Draw Instructions
is selected.
2
, at point
126