I have resolved the roots of a series both numerically & analytically. Let me qualify numerical versus analytical. Analytically I evaluate the series without substituting values for the various parameters of the series. I then differentiate the series, then substitute in the appropriate parametric values, & then solve. By this method I obtained 5 complex roots.
The numerical approach has values already assigned to the parameters of the series. I then differentiate & solve. I obtain only REAL roots in this instance. I then restricted these results to obtain the solution I believe to be correct given by result (7).
I cannot seem to steer the solver in the analytic case to obtain the correct REAL result that I am expecting. Can anyone help on this?
Before any website moderator thinks this is the same question as Error-in-Isinternal-Too-Many-Levels, it is not. I have resolved that question. This is a different question, but on the same problem!