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Mathematica collect function,

• To: mathgroup at smc.vnet.net
• Subject: [mg121189] Mathematica collect function,
• From: HOANG <hoangnhuy83 at yahoo.com>
• Date: Sat, 3 Sep 2011 08:05:24 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi all, 

I would like to use the collect function for this:

(1 + 2 Z +  Z Z.U)^2 + (1 + 2 Z + Z Z.U) (Z (1 + Z) + Z.U (Z + Z Z.U)) + (1 + Z + Z.U + (Z.U)^2) (Z (1 + Z) + Z.U (Z + Z Z.U)) + (Z (1 + Z) + Z.U (Z + Z Z.U)) (Z (1 + Z.U) + Z.U (Z + (Z.U)^2))
This is what I tried in Mathematica:

Collect[(1 + 2*Z + Z* Z*U)^2 + (1 + 2*Z + Z* Z*U)* (Z* (1 + Z) + Z*U* (Z + Z* Z*U)) + (1 + Z + Z*U + (Z*U)^2)* (Z *(1 + Z) + Z*U (Z + Z *Z*U)) + (Z* (1 + Z) + 
Z*U* (Z + Z* Z*U)) *(Z* (1 + Z*U) + Z*U *(Z + (Z*U)^2), Z]


But it does not work 
However, it works when I tried this one:

Collect[(1 + Z)^2 + (1 + Z)*(Z + Z*Z*U) + (1 + Z*U)* (Z + Z*Z*U) + (Z +Z*Z*U)*(Z +(Z*U)^2) + Z *((1 + Z)^2 + (1 + Z*U)* (Z + Z* Z*U)) + Z*U *((1 + Z)* (Z + Z*Z*U) + (Z + Z* Z*U)* (Z + (Z*U)^2)), Z]

Someone knows why? thanks for your answer