lim[(cos1/n)^n^3]^(1/n)=lim(cos1/n)^(n^2)=lim(1+cos1/n-1)^(n^2)=lim[(1+cos1/n-1)^(1/(cos1/n-1))]^ [(n^2)((cos1/n-1)]lim[(1+cos1/n-1)^(1/(cos1/n-1))]=elim[(n^2)((cos1/n-1)]=limn^2(-1/(2n^2))=-1/2极限=e...