Texas Instruments TI-89 Titanium Short User Manual page 162

ans()
2 ± key
ans() ⇒
value
) ⇒
integer
ans(
Returns a previous answer from the Home screen
history area.
integer
answer to recall. Valid range for
to 99 and cannot be an expression. Default is 1,
the most recent answer.
approx()
MATH/Algebra menu
expression
approx(
Returns the evaluation of
value, when possible, regardless of the current
Exact/Approx
This is equivalent to entering
pressing ¥ ¸ on the Home screen.
) ⇒
list1
approx(
matrix1
approx(
Returns a list or matrix where each element has
been evaluated to a decimal value, when
possible.
Archive
CATALOG
var1
Archive
Moves the specified variables from RAM to the
user data archive memory.
You can access an archived variable the same as
you would a variable in RAM. However, you
cannot delete, rename, or store to an archived
variable because it is locked automatically.
To unarchive variables, use
arcLen()
MATH/Calculus menu
expression1
arcLen(
Returns the arc length of
with respect to variable
end
Regardless of the graphing mode, arc length is
calculated as an integral assuming a function
mode definition.
list1,var,start,end
arcLen(
Returns a list of the arc lengths of each element
list1
of
augment()
MATH/Matrix menu
list1, list2
augment(
Returns a new list that is
end of
156
value
, if included, specifies which previous
) ⇒
value
expression
mode.
expression
list
) ⇒
matrix
var2 var3
[, ] [, ] ...
Unarchiv
) ⇒
var start end
, , ,
expression1
var
) ⇒
list
start end
from to with respect to
) ⇒
list
list2
.
list1
To use
sequence on the Home screen, press:
1 ¸
1 ¸
2 ± « 2 ± A 0 2 ¸
¸
is from 1
integer
¸
approx(p) ¸
as a decimal
and
approx({sin(p),cos(p)}) ¸
approx([‡(2),‡(3)]) ¸
10!arctest ¸
Archive arctest ¸
5ùarctest ¸
15!arctest ¸
.
N
Unarchiv arctest ¸
15!arctest ¸
expression
arcLen(cos(x),x,0,p) ¸3.820
from start to
arcLen(f(x),x,a,b) ¸
.
arcLen({sin(x),cos(x)},x,0,p)
var
.
augment({1,ë3,2},{5,4}) ¸
appended to the
Appendix A: Functions and Instructions
to generate the Fibonacci
ans()
[1.414
b
⌠
d
( (f(x)))ñ+1 dx
⌡
dx
a
{3.820
{1 ë3 2 5 4}
1
1
2
3
5
3.141 ...
ë1.}
{0.
... ...
1.732 ]
10
Done
50
Done
15
...
... 3.820 ... }