Texas Instruments TI-89 Titanium User Manual page 239

Typing the "With" Operator
To type the with
" "
@
Í
Substituting for a Variable
For every occurrence of a specified variable,
you can substitute a numeric value or an
expression.
To substitute for multiple variables at the
same time, use the Boolean and operator.
Symbolic Manipulation
operator ( | ), press:
3
First derivative of x
at x = 5
236