My students had trouble with plotting cos(x^(1/3)) as a homework problem.
What's happening is that x^(1/3) generates a primitive complex root so I
explained that to them, then I found this work around:
def oddroot(x,n):
sgn(x)*(abs(x))^(1/n)
This is work for any odd number n and will plot nicely over all of R. I
see others have had this question on the forum so I thought I'd share.
I don't know if the devs want to implement something like this into SAGE
more generally, probably not, but at least this is a work around for simple
graphing etc.
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