求limx->无穷[1/sin3/x-1/sin2/x]
问题描述：
求limx->无穷[1/sin3/x-1/sin2/x]
答
原式=lim 1/sin3/x-lim1/sin2/x
=lim t-〉0 1/sin3t-lim1/sin2t
=1/3-1/2
=-1/6