ex-e *-2x 例3.2.2求1im x-→0 x-si x 解：im et-ex-2x e*+ex-2 ex-e-x lim lim x-→0 x-sin x x-→0 1-cosx x-→0 sin x lim e+e=2. x→0 cos x BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS PRESS e-0C⑨8 目录上页下页返回结束目录 上页 下页 返回 结束 例3.2.2 求 解: