lim(x→0＋)lntan3x/lntan2x (∞/∞) =lim(x→0＋)(3sec^2 3x/tan3x)/(2sec^2 2x/tan2x) =lim(x→0＋)(3sec^2 3x*tan2x)/(2sec^2 2x*tan3x) =1
