Collect
 Usage
• 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.
Notes
• 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. • New in Version 1; modified in 3.
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