simplify exponentials sum

• Subject: simplify exponentials sum
• From: Renzo Del Fabbro
• Date: Sat, 8 Sep 2012 10:35:49 +0000 (UTC)

Hi, 

how can I  simplify the following expression by grouping together the first and 
the second term as well as the third and the fourth, with the same exponent?

(%i1)es:2*exp(-3*t/2)*
(18*sinh(sqrt(5)*t/2)/sqrt(5)-6*cosh((sqrt(5)*t/2)))+12,exponentialize,expand;

Thanks

Regards 
Renzo

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