Symbolic Manipulation 226
Temporarily Overriding a Variable
By using the
“with” operator ( | ), you can:
Note: For more information about the | operator, refer to Typing the “With” Operator.
To type the
“with” operator ( | ), press:
@ Í
Using Exact, Approximate, and Auto Modes
The Exact/Approx mode settings, which are described briefly in Operating the Handheld,
directly affect the precision and accuracy with which the TI-89 Titanium calculates a
result. This section describes these mode settings as they relate to symbolic
manipulation.
EXACT Setting
When Exact/Approx = EXACT, the handheld uses exact rational arithmetic with up to
614 digits in the numerator and 614 digits in the denominator. The EXACT setting:
• Temporarily override a variable’s defined
value.
• Temporarily define a value for an
undefined variable.
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