TI-83 Plus Draw Instructions 223
Tip: 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( (tangent line) draws a line tangent to expression in terms of X,
such as Y1 or X2, at point X=value. X can be an expression. expression is
interpreted as being in Func mode.
Tangent(expression,value)