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matematikuvol
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Homework Statement
Find inverse Laplace transform
[tex]\mathcal {L}^{-1}[\frac{1}{(s^2+a^2)^2}][/tex]
Homework Equations
The Attempt at a Solution
I try with theorem
[tex]\mathcal{L}[f(t)*g(t)]=F(s)G(s)[/tex]
So this is some multiple of
[tex]\mathcal{L}[\sin at*\sin at][/tex]
So [tex]\mathcal {L}^{-1}[\frac{1}{(s^2+a^2)^2}]=\propto \sin at*\sin at [/tex]
Or
[tex]\mathcal {L}^{-1}[\frac{1}{(s^2+a^2)^2}]=\propto \int^t_0\sin aq \sin(at-aq)dq [/tex]
Is there some easier way?
Tnx for answer.