sage: ((x^-5+2*x^(1/3))^(1/5)).integral(x,.2,.3)
-3/64*(-1)^(1/5)*sqrt(2*sqrt(5) - 10)*log(sqrt(1.0....
...
sage: _.n()
0.405689098012116 + 0.0000627092036312171*I
sage: ((x^-5+2*x^(1/3))^(1/5)).nintegrate(x,.2,.3)
(0.4055729987450207, 4.50276481372992e-15, 21, 0)
Wolfram Alpha favors the latter result.