lim(x→o)/=
问题描述：
lim(x→o)/=
答
因为当x趋向于0,a^x-1~xlna,1-cosx~x^2/2
所以原式=lim(x→o)(x^2ln3)/[(1-cosx)/2]
=2ln3*lim(x→o)x^2/(x^2/2)
=4ln3