推 amymayyam:第一題前面我問過140.127.179.227 07/08
推 vnn:喔喔~拍謝>"<218.169.239.176 07/08
推 amymayyam:可是忘記在哪問了耶 抱歉140.127.179.227 07/08
請問兩題....
n 1
1.limΣ ------------------ =?
n->∞ (4n^2-k^2)^(1/2)
2. let 1-cosx
---------if x=/=0
x
f(x)=
0 if x=0
prove that f is differentiable on R,and f'(x)=?
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 218.164.194.56