/ 4 \ | x | lim |-------| x->-1+| 4| \-1 + x /
Limit(x^4/(-1 + x^4), x, -1)
-oo
= -37.1270763936258
/ 4 \ | x | lim |-------| x->-1-| 4| \-1 + x /
oo
= 38.3770626882969
-37.1270763936258