Software to do formal expansion of $(1+x)^{8/3}$ or an any fraction

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I am looking for something light ( suggestions for install are ok) Typically I need to have enough terms for $a^4\left(1+a^{-1}\right)^{\left(8/3\right)}$ None of symbolab / geogebra / quickmath seem to give the result. I did it by hand , yet my need is to check and do many other formula.