Texas Instruments TI-89 Manual Book page 82

This floating-point number
causes numeric results to
be shown as floating-point.
If a floating-point whole
number is entered as an
exponent, it is treated as
an integer (and does not
produce a floating-point
result).
How Long Is the
Simplification
Process?
¦
Identities involving zeros and ones
are exploited.
¦
Polynomial greatest common
divisors are canceled.
¦
Polynomials are expanded unless
no key cancellation can occur.
¦
Common denominators are
formed unless no key cancellation
can occur.
¦
Functional identities are
exploited. For example:
ln(2x) = ln(2) + ln(x)
and
sin(x)ñ + cos(x)ñ = 1
Depending on the complexity of an entry, result, or intermediate
expression, it can take a long time to expand an expression and
cancel common divisors as necessary for simplification.
To interrupt a simplification process that is taking too long,
press ´. You can then try simplifying only a portion of the
expression. (Auto-paste the entire expression on the entry line, and
then delete the unwanted parts.)
No key cancellation
No key cancellation
Chapter 3: Symbolic Manipulation 65