练习题 In(1+x) m x→0 2。lim In tan x x→>0 In tan2x 3. lim In sinx x→7(x-2x)2 11181 n(1+ m x→>+ oo arctan x练习题 x x x ln(1 ) 1. lim 0 + → x x x ln tan 2 ln tan7 2. lim →0 1 1 2 2 ( 2 ) lnsin 3. lim x x x→  − x x x arctan ) 1 ln(1 4. lim + →+  1 8 1 −