AlanStevens wrote:
I think it's clear enough where the extra solutions come from; Mathcad must do something like the following on solving the equation.
Thank! Yes, at least with your explanation its clear what happens.
Nevertheless a bug which should not happen.
Also intersting the different behaviour when using the fourth root instead.
I know the difference between (-1)^(1/3) and the third root of -1 (only the latter is -1) but not sure about the fourth root and how the symbolics sees it.
Werner