68
Alphabetical Listing
expand()
Catalog >
expand(
Expr1
,
Var
)
returns
Expr1
expanded with respect to
Var
. Similar
powers of
Var
are collected. The terms and
their factors are sorted with
Var
as the
main variable. There might be some
incidental factoring or expansion of the
collected coefficients. Compared to
omitting
Var
, this often saves time,
memory, and screen space, while making
the expression more comprehensible.
Even when there is only one variable, using
Var
might make the denominator
factorization used for partial fraction
expansion more complete.
Hint: For rational expressions,
propFrac()
is
a faster but less extreme alternative to
expand()
.
Note:
See also
comDenom()
for an
expanded numerator over an expanded
denominator.
expand(
Expr1
,[
Var
]
)
also distributes
logarithms and fractional powers
regardless of
Var
. For increased
distribution of logarithms and fractional
powers, inequality constraints might be
necessary to guarantee that some factors
are nonnegative.
expand(
Expr1
, [
Var
]
)
also distributes
absolute values,
sign()
, and exponentials,
regardless of
Var
.
Note:
See also
tExpand()
for trigonometric
angle-sum and multiple-angle expansion.
expr()
Catalog >
expr(
String
)
⇒
expression
Returns the character string contained in
String
as an expression and immediately
executes it.
Содержание TI-Nspire CAS
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