Easy Laplace Transform help!

  • Thread starter winbacker
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"easy" Laplace Transform...help!

1. The problem statement, all variables and given/known data


Evaluate L{(e^-2t)*t*sinht}


2. Relevant equations

translation theorem


3. The attempt at a solution

Just to clarify: the contents of the bracket is the product of 3 terms:
e^-2t (e to the power of -2t)
t
sinht

all multiplied together.

I am ok with finding the laplace of 2 term products but with 3 terms I do not know where to begin. All I can think of is that the presence of the euler term suggests the use of the 2nd translation theorem.

Any help would be appreciated.
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
 

rock.freak667

Homework Helper
6,230
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Re: "easy" Laplace Transform...help!

Start with L{sinhkt}, I hope you know what this is.

Now use the fact that L(tf(t)}= -F'(s)

Now just apply the shift property for L{e-2tf(t)}
 
Re: "easy" Laplace Transform...help!

You can express sinh t in terms of e^t and e^-t. Do that and combine all the exponentials together. That way you can express the whole thing as a sum of Laplace transforms of t at different points.
 

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