noob here needing help!
Calculated three numbers and wanted to add them together but got:
"Result above max. allowed positive number."
The calculated numbers were:
Rp=3.316
Rn=2.411
Rs=4.361
Rtotal=Rp+Rn+Rs gives the error

Sorry, My bad.
Was using a series expansion to calculate sinh rather than the built in sinh.
Using the supplied sinh (for some reason) doesn't give the error.