my limits wont work

lim1= [nthroot(x^6+8,3)/4x^2+nthroot(3x^4+1,2)];

limit(lim1,x, Inf)

i am trying to evaluate the limit but no matter what i keep getting erros and i cant state ((x^6+8)^1/3)/(4x^2+t(3x^4+1)^(1/2)) where in the limit fuction can recognize it so i can get the answer

Answer 1

[Torsten]

syms x
lim1= [nthroot(x^6+8,3)/4*x^2+nthroot(3*x^4+1,2)]

lim1 = 

limit(lim1,x, Inf)

ans = 

∞