factor(x^4+1) and partfrac(1/(x^4+1))

[rombva]

(10-22-2019 10:33 PM)Joe Horn Wrote:  ...
Check your CAS settings. Near the bottom of the first page, in the left column, the second item is "Use square roots to factor polynomials". When that's turned on (the default setting), it yields the result you want:
...

With default settings I get the input polynomial.