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  • $\begingroup$ Each question should be standalone, so please include the expression in your question that you would like to simplify. $\endgroup$ Commented Mar 31, 2014 at 16:02
  • $\begingroup$ @RunnyKine I edited my question. Sorry for any caused trouble. $\endgroup$ Commented Mar 31, 2014 at 16:21
  • $\begingroup$ I was using wrong the TrigExpand function, so what I did to solve the problem was lapla1 /. {Sin[2 \[Gamma]] -> 2 Sin[\[Gamma]] Cos[\[Gamma]] , Cos[2 \[Gamma]] -> Cos[\[Gamma]]^2 - Sin[\[Gamma]]^2} // ExpandAll // TraditionalForm. Sorry for any inconvenience $\endgroup$ Commented Mar 31, 2014 at 17:53