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Collect

collects together terms involving the same powers of objects matching x.

collects together terms that involve the same powers of objects matching

, ....

applies h to the expression that forms the coefficient of each term obtained.

Collect effectively writes expr as a polynomial in x or a fractional power of x.

Collect automatically threads over lists in expr, as well as equations, inequalities and logic functions.

Collect terms involving

Collect each power of

Simplify each coefficient:

Collect terms involving

Out[1]=

Collect each power of

Out[1]=

Simplify each coefficient:

Out[2]=

A polynomial:

A Puiseux polynomial:

Collect with respect to two variables:

Collect with respect to a pattern:

Collect derivative terms:

Collect over the integers modulo 2:

Expand is effectively the inverse of Collect:

The order of variables matters: