证明当x趋近于0时arccotx除以x的极限等于1

问题描述:

证明当x趋近于0时arccotx除以x的极限等于1

  错了,应该是
 lim(x→0)(arctanx/x)
  = lim(x→0)(t/tant) (x = tant)
  = lim(x→0)(t/sint)*cost
  = 1*1 = 1.