Drawing Tangent Lines - Texas Instruments TI-82 STATS Manual Book

Drawing Tangent Lines

Drawing
a Tangent Line
Directly
on a Graph
Drawing
a Tangent Line
from the Home
Screen or
a Program
8–8 Instructions
DRAW
To draw a tangent line when a graph is displayed, follow these
steps.
1. Select
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
function is displayed in the top-left corner, if
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
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
Tip: Change the fixed decimal setting on the mode screen if you want
to see fewer digits displayed for
(tangent line) draws a line tangent to expression in
Tangent(
terms of , such as
X
expression. expression is interpreted as being in
expression
Tangent(
from the menu.
DRAW
mode, the value at which the tangent
Func X
value is displayed.
X
and the equation for
2
or , at point
Y X X
1
value
, )
is
ExprOn
Y
.
=value. can be an
X
mode.
Func
Y=