Hello there, I posted your second question in hp forums, and there is not an easy solution to that problem. Giancarlo Mattioni suggested this:
" If you don't mind, I'd point you to a comp.sys.hp48 thread (not that recent...):
http://groups.google.com/group/comp.sys.hp48/browse_frm/thread/375e156699e66
951/ebc3964b576b5bc1?hl=it&lnk=gst&q=whole+graph#ebc3964b576b5bc1
In summary, the "other half" of the graph can't be showed as it is "made of" complex values for negative x values.
I think you can catch the picture you want if you try to graph:
Y1(X)=|X^(5/3)| "
So I tried the IFTE function like this: IFTE(X>0,X^(5/3),-ABS(X^(5/3))), it isn't an elegant solution but it works.