问题标题:
lim(x→0)sin5x/tan2x怎么求,
问题描述:

lim(x→0)sin5x/tan2x怎么求,

孙连恒回答:
  lim(x→0)sin5x/tan2x   =lim(x→0)(sin5x/5x·5x/2x·2x/tan2x)   =lim(x→0)(sin5x/5x)·lim(x→0)(5x/2x)·lim(x→0)(2x/tan2x)   =1·5/2·1   =5/2
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