= lim(x->;∞){a^[1/x(x 1)-1]}/(1/x^2)
= lim(x->;∞ ){[1/x(x 1)×lna}/(1/x^2)
= lim(x->;∞) {x/(x 1)×lna}
= lim(x->;∞){ 1/(1 1/x)×lna }
=lna
= lim(x->;∞){a^[1/x(x 1)-1]}/(1/x^2)
= lim(x->;∞ ){[1/x(x 1)×lna}/(1/x^2)
= lim(x->;∞) {x/(x 1)×lna}
= lim(x->;∞){ 1/(1 1/x)×lna }
=lna