I doubt an Excel spreadsheet can handle this but it's worth asking, since I have been trying and searching for a long time with no success.
Entering this into a cell:
=complex(abs(-1.5*(-1.5)^(-1.5))),0)
and the cell output is #NUM!
The output should be: 0.8164966
I played with this a bit and didn't get anywhere - this article may explain why. Link
it's complicated, and I think it's more than an excel problem