Question: Numerical answer to inverse laplace transform of 3rd order equation?

Hi guys, can someone tell me how I can get a numerical answer to the following question:

 

>with(inttrans):

>invlaplace (15/(s+ 6s2 + 15s + 15), s, t)


The answer I receive from entering the above commands is not the numerical answer. I know that the answer should contain sines/cosines/exponentials - how do I get that?

 

thx

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