Texas Instruments TI-89 Manual Book page 439

comDenom(expression1,var)
ratio of numerator and denominator expanded
with respect to
are sorted with
Similar powers of
might be some incidental factoring of the
collected coefficients. Compared to omitting
, this often saves time, memory, and screen
var
space, while making the expression more
comprehensible. It also makes subsequent
operations on the result faster and less likely to
exhaust memory.
If does not occur in
var
comDenom(expression1,var)
ratio of an unexpanded numerator over an
unexpanded denominator. Such results usually
save even more time, memory, and screen
space. Such partially factored results also
make subsequent operations on the result
much faster and much less likely to exhaust
memory.
Even when there is no denominator, the
comden
partial factorization if
exhausts memory.
Hint: Enter this
and routinely try it as an alternative to
comDenom()
conj()
MATH/Complex menu
conj(expression1)
conj(list1)
conj(matrix1)
Returns the complex conjugate of the
argument.
Note: All undefined variables are treated as
real variables.
CopyVar
CATALOG
CopyVar var1, var2
Copies the contents of variable
If does not exist,
var2
Note:
CopyVar
instruction (! ) when you are copying an
expression, list, matrix, or character string
except that no simplification takes place
when using
with non-algebraic variable types such as Pic
and GDB variables.
422 Appendix A: Functions and Instructions
returns a reduced
. The terms and their factors
var
as the main variable.
var
are collected. There
var
expression1
returns a reduced
function is often a fast way to achieve
is too slow or if it
factor()
function definition
comden()
and .
factor()
expression
list
matrix
var1
creates it.
CopyVar
is similar to the store
. You must use
CopyVar
comDenom((y^2+y)/(x+1)
^2+y^2+y,x) ¸
comDenom((y^2+y)/(x+1)
^2+y^2+y,y) ¸
comDenom(exprn,abc)!comden
,
(exprn) ¸
comden((y^2+y)/(x+1)^2+y^2+y)
¸
comden(1234x^2ù (y^3ì y)+2468x
ù (y^2ì 1)) ¸
conj(1+2i) ¸
conj([2,1ì 3i;ë i,ë 7]) ¸
conj(z)
conj(x+iy)
x+y! a ¸
10! x ¸
to
var2.
CopyVar a,b ¸
a! c ¸
DelVar x ¸
b ¸
c ¸
CopyVar
1234ø xø (xø y + 2)ø (yñ ì 1)
1 ì 2ø i
2 1+3ø i
i
x + ë iø y
Done
ë 7
z
x + y
10
Done
y + 10
Done
x + y
y + 10