182
Alphabetical Listing
tCollect()
Catalog >
tCollect(
Expr1
)
⇒
expression
Returns an expression in which products
and integer powers of sines and cosines are
converted to a linear combination of sines
and cosines of multiple angles, angle sums,
and angle differences. The transformation
converts trigonometric polynomials into a
linear combination of their harmonics.
Sometimes
tCollect()
will accomplish your
goals when the default trigonometric
simplification does not.
tCollect()
tends to
reverse transformations done by
tExpand()
.
Sometimes applying
tExpand()
to a result
from
tCollect()
, or vice versa, in two
separate steps simplifies an expression.
tExpand()
Catalog >
tExpand(
Expr1
)
⇒
expression
Returns an expression in which sines and
cosines of integer-multiple angles, angle
sums, and angle differences are expanded.
Because of the identity (sin(x))2+(cos
(x))2=1, there are many possible equivalent
results. Consequently, a result might differ
from a result shown in other publications.
Sometimes
tExpand()
will accomplish your
goals when the default trigonometric
simplification does not.
tExpand()
tends to
reverse transformations done by
tCollect()
.
Sometimes applying
tCollect()
to a result
from
tExpand()
, or vice versa, in two
separate steps simplifies an expression.
Note:
Degree-mode scaling by
π
/180
interferes with the ability of
tExpand()
to
recognize expandable forms. For best
results,
tExpand()
should be used in Radian
mode.
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