作者Frobenius (i^(-i)= e^(π/2))
看板trans_math
标题Re: [积分]
时间Sat Apr 14 00:38:44 2007
※ 引述《king911015 (早已放弃爱上你)》之铭言：
: ∞ 1
: 求 Σ (-1)^n -------
: n=0 (2n+1)!
∞ 1^(2n+1) ∞ x^(2n+1) |
Σ (-1)^n -------- = Σ (-1)^n -------- |
n=0 (2n+1)! n=0 (2n+1)! |x=1
|
= Sin(x) | = Sin(1)
|x=1
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.122.225.109
1F：推 king911015:这是用什麽方法啊?我看不懂为什麽变这 218.175.72.108 04/14 11:29
2F：推 vu3cj0su3:Maclaurin series 59.117.53.129 04/14 15:01
3F：→ goshfju:by 微积分课本= =| 59.117.81.35 04/15 00:15