Question: Inverse Fourier transform

Hi,

I would like to calculate the inverse fourier transform from this: 

fourier(laplace(g(x, t), t, s), x, k) = exp(-s*`&tau`-I*Zeta*k)/(s+a^2*k^2)

And I get this:

laplace(g(x, t), t, s) = exp(-s*`τ`)*invfourier(exp(-I*Zeta*k)/(s+a^2*k^2), k, x)

So the function is not completely transformed. Can someone help me to find an expression without the "invfourier" in the last expression?

Thanks in advance!

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