Texas Instruments TI-83 PLUS - Manual (Page 216)

TI-83 Plus Draw Instructions 213
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.