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InverseLaplaceTransform


With 
InverseLaplaceTransform[p^i/(p^4-k^4), p, t]
with i = 0,1,2,3
I do not get combinations of sin and sinh or cos and cosh
but combinations of sin and Exp[z]-Exp[-z] or cos and Exp[z]+Exp[-z].

How can I change InverseLaplaceTransform to get hyperbolic
functions als results.

h.f.s.
--
Hans Friedrich Steffani
Institut fuer Elektrische Maschinen und Antriebe
TU Chemnitz-Zwickau
e-mail: hans.steffani at e-technik.tu-chemnitz.de

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