"l'Hopital's rule" f = log(1 - alpha / n^2) g = 1 / n check(d(f,n) == 2 alpha / (n^3 - alpha n)) check(d(g,n) == -1 / n^2) y = d(f,n) / d(g,n) check(y == 2 alpha / (alpha / n - n)) "ok" Run