Your problem as it is posed is apparently easily solved by Mathcad 14, which uses a different symboloc engine from that used by mathcad 13 and previous.
With Laplace transform the maple engine works unpredictable in the sense that you never can tell which formulation of the problem it will solve, and which it won't.
In some cases it helps to reformat the equation. Sometimes a "simplify" before the transform will help, sometimes it will destroy.
You wrote that you derived the expression yourself. My advice is to try to transform a less "simplified" version of your equation, preferrably one that has a denominator of the form s*(s+a)*(s+b)*(s+c). It may sometimes also be wise to keep the expression symbolical until after the transform.
I've added another expression that Mathcad 11 is happy to transform. I've introduced a number of symbols. I guess that, from the knowledge of the circuit, you should be able to write it out with less (in number), but far more meaningfull symbols (being circuit element values).
This file is made in Mathcad 11. It is generally wise to save your files for this forum in Mathcad 11 (.MCD) format, because some users didn't go any further than Mathcad11...
Success!
Luc
