Texas Instruments TI-84 - Manual (Page 188)

Chapter 8: Draw Instructions 185
3. Press
y <
5 to select 5:Tangent( . The
tangent instruction is initiated.
4. Press
y C
2
¤ ¥
2 .
5. Press
Í. The tangent line is drawn; the X
value and the tangent-line equation are displayed
on the graph.