用x趋向于0 sinx/x=1 怎么做lim(x→0) x^2/sin^2(X/3)

问题描述:

用x趋向于0 sinx/x=1 怎么做lim(x→0) x^2/sin^2(X/3)

sin^2怎么理解不好意思 是lim(x→0) x^2/(sin(X/3))^2