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Simplification question

• To: mathgroup at smc.vnet.net
• Subject: [mg95067] Simplification question
• From: TL <latev at shaw.ca>
• Date: Mon, 5 Jan 2009 03:27:49 -0500 (EST)

can anyone please confirm this:

On my machine Mathematica 6.03 produces:

Simplify[dab^2 Cos[2 \[Alpha]] - dab^2 + 2 dbp^2]
-dab^2 + 2 dbp^2 + dab^2 Cos[2 \[Alpha]]


FullSimplify[dab^2 Cos[2 \[Alpha]] - dab^2 + 2 dbp^2]
-dab^2 + 2 dbp^2 + dab^2 Cos[2 \[Alpha]]




FullSimplify[dab^2 (Cos[2 \[Alpha]] - 1) + 2 dbp^2]
2 (dbp^2 - dab^2 Sin[\[Alpha]]^2)

Simplify[dab^2 (Cos[2 \[Alpha]] - 1) + 2 dbp^2]
2 (dbp^2 - dab^2 Sin[\[Alpha]]^2)


FullSimplify[-dab^2 + 2 dbp^2 +
  dab^2 Cos[2 \[Alpha]] - (-2 dab^2 Sin[\[Alpha]]^2 + 2 dbp^2)]
0



Checked on v7 - same result!