In the following worksheet, evalf[4997](... does what I expected and evalf[4998](... does not.

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See (3) and (10) in the worksheet.

Can anybody help me understand what is happening inside the CAS?  I know that 4998 is an obscene number of digits but on my Wintel machine:

> kernelopts(maxdigits);

returns 268,435,448

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