Texas Instruments TI-89 Titanium User Manual page 243

- Substituting for more general
expressions (either
2
ø
or
c m=e
anticipate.
Use the
Note: solve
the single-variable substitution.
Specifying Domain Constraints
Many identities and transformations are valid for only a particular domain. For example:
ln(x y) = ln(x) + ln(y)
†
1 (sin(
-
Sin )) =
q q
Use the with operator to specify the domain constraint.
" "
Because ln(x y) = ln(x) + ln(y) is not always valid,
†
the logarithms are not combined.
With a constraint, the identity is valid and the
expression is simplified.
Symbolic Manipulation
2
ø
m c =e
) may not work as you
function to help determine
No match for
substitution
only if and/or is
x y
not negative
only if q ‚ Lp and q
/2
radians
 p /2
240