Collect
Collect[
expr
,
x
] collects together terms involving the same powers of objects matching x.
Collect[
expr
,
,
, ... 
] collects together terms that involve the same powers of objects matching  ,  , ... .
Collect[
expr
,
var
,
h
] applies h to the expression that forms the coefficient of each term obtained.
Collect[
expr
,
x
] effectively writes expr as a polynomial in x or a fractional power of x.
Examples: Collect[x + n x + m, x]
 ; Collect[(1+x+y)^3, x]
 .
Collect[
expr
,
x
,
Simplify] can be used to simplify each coefficient separately.
See The Mathematica Book on the web:Section 1.4.5 and Section 3.3.1.
See also: Series, CoefficientList, Together, Cases.
Further Examples
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