Texas Instruments TI-89 Manual Book page 466

Use the "|" operator to restrict the solution
interval and/or specify the sign of other
undefined variables.
For the
APPROX
mode,
fMax()
approximate local maximum. This is often
faster, particularly if you use the "|" operator
to constrain the search to a relatively small
interval that contains exactly one local
maximum.
Note: See also
fMin()
MATH/Calculus menu
fMin(expression, var)
Returns a Boolean expression specifying
candidate values of
expression
Use the "|" operator to restrict the solution
interval and/or specify the sign of other
undefined variables.
For the APPROX
mode,
fMin()
approximate local minimum. This is often
faster, particularly if you use the "|" operator
to constrain the search to a relatively small
interval that contains exactly one local
minimum.
Note: See also
FnOff
CATALOG
FnOff
Deselects all Y= functions for the current
graphing mode.
In split-screen, two-graph mode,
applies to the active graph.
FnOff [1] [, 2] ... [,99]
Deselects the specified Y= functions for the
current graphing mode.
FnOn
CATALOG
FnOn
Selects all Y= functions that are defined for
the current graphing mode.
In split-screen, two-graph mode,
applies to the active graph.
setting of the
Exact/Approx
iteratively searches for one
and .
fMin() max()
Boolean expression
that minimize
var
or locate its greatest lower bound.
setting of the Exact/Approx
iteratively searches for one
fMax() and min() .
FnOff
FnOn
fMax(.5x^3ì xì 2,x)|x1 ¸
fMax(aù x^2,x) ¸
x = ˆ or x = ë ˆ or x = 0 or a = 0
fMax(aù x^2,x)|a<0 ¸
fMin(1ì (xì a)^2ì (xì b)^2,x) ¸
fMin(.5x^3ì xì 2,x)|x‚1 ¸ x = 1
fMin(aù x^2,x) ¸
x = ˆ or x = ë ˆ or x = 0 or a = 0
fMin(aù x^2,x)|a>0 and x>1 ¸
fMin(aù x^2,x)|a>0 ¸
only
In function graphing mode:
FnOff 1,3 ¸
.
y3(x)
In parametric graphing mode:
FnOff 1,3 ¸
, and
xt3(t) yt3(t)
only
Appendix A: Functions and Instructions
x = ë.816...
x = 0
x = ˆ or x = ë ˆ
x = 1.
x = 0
deselects and
y1(x)
deselects xt1(t) , yt1(t) ,
.
449