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Re: [積分] Integrate ln(a + bcosx)

[ trans_math ]7 留言, 推噓總分: +2

作者: suhorng - 發表於 2012/05/19 00:00(12年前)

6^F→suhorng:我也覺得是一樣的做法只不過求常數在我這61.217.34.135 05/20 18:26

7^F→suhorng:邊變成了內層積分的下界XD61.217.34.135 05/20 18:26

Re: [單變] 級數跟瑕積分

[ trans_math ]3 留言, 推噓總分: +2

作者: PaulErdos - 發表於 2012/05/17 23:37(12年前)

1^F推suhorng:原來如此...難怪那麼難.....61.217.35.84 05/18 08:21

Re: [單變] 級數跟瑕積分

[ trans_math ]3 留言, 推噓總分: +1

作者: suhorng - 發表於 2012/05/17 21:45(12年前)

2^F→suhorng:Apply ratio test61.217.35.84 05/18 09:34

3^F→suhorng:lim 2(n+1)^2 /[ (2n+2)(2n+1) ] < 161.217.35.84 05/18 09:35

[積分] Integrate ln(a + bcosx)

[ trans_math ]19 留言, 推噓總分: -1

作者: WeiFanL - 發表於 2012/05/15 10:28(12年前)

5^F→suhorng:我算出來也沒有在ln裡面除以二,而且不知道61.217.35.84 05/16 18:18

6^F→suhorng:為什麼是√(a^2-b^2)...61.217.35.84 05/16 18:18

7^F→suhorng:更奇怪的是我是除以a = =61.217.35.84 05/16 18:18

10^F→suhorng:是因為沒有說a和b的大小的關係嗎如果有61.217.35.84 05/16 21:00

11^F→suhorng:a>b那就不是瑕積分了...?61.217.35.84 05/16 21:00

[考古] 98台聯大收斂

[ trans_math ]2 留言, 推噓總分: 0

作者: claudina - 發表於 2012/05/13 11:29(12年前)

1^F→suhorng:一般項不趨近061.217.35.138 05/13 11:32

[考古] 98台聯大微積分基本定理

[ trans_math ]3 留言, 推噓總分: +1

作者: claudina - 發表於 2012/05/13 10:00(12年前)

1^F推suhorng:鏈鎖律, 應該是 2x f(x^2) 才對61.217.35.138 05/13 10:02

2^F→suhorng:查一下微積分基本定理的內容.61.217.35.138 05/13 10:02

[多變] 一題Lagrange

[ trans_math ]3 留言, 推噓總分: +2

作者: pp20624 - 發表於 2012/05/11 20:16(12年前)

1^F推suhorng:2x(2λx^2 - 1) = 0, 2y(2λy^2 - 1) = 0.61.217.35.215 05/11 22:43

2^F→suhorng:配合x^4+y^4=161.217.35.215 05/11 22:43

[斂散]92交大會考斂散問題

[ trans_math ]1 留言, 推噓總分: +1

作者: jjx66os - 發表於 2012/05/08 00:20(12年前)

1^F推suhorng:|sin n|<=1. Σ <= Σ| | <= Σ1/n^2 < ∞59.115.145.42 05/08 08:40

[多變] 一題偏微分的問題

[ trans_math ]5 留言, 推噓總分: +1

作者: yoyooyooo - 發表於 2012/04/23 11:41(12年前)

1^F推suhorng:f_x, f_y就都用定義去算就好(極限那個)61.217.34.196 04/23 19:43

2^F→suhorng:檢查f(x,y)在(0,0)是否可微也可以看定義61.217.34.196 04/23 19:43

3^F→suhorng:的那個極限是不是0 或是說如果f在(0,0)可61.217.34.196 04/23 19:44

4^F→suhorng:微那必須D_u f = ▽f．u, 想辦法找個u使61.217.34.196 04/23 19:44

5^F→suhorng:等號不成立=>不可微61.217.34.196 04/23 19:44

[考古] 一題極限

[ trans_math ]23 留言, 推噓總分: +2

作者: harry007 - 發表於 2012/04/19 21:58(12年前)

1^F推suhorng:因為x^2 sin(1/x)在0的微分並非如你所想是61.217.33.29 04/19 22:00

2^F→suhorng:2x sin(1/x) - cos(1/x), x代0.....61.217.33.29 04/19 22:02

4^F→suhorng:如果硬要l'Hopital, 分子請用定義求微分61.217.33.29 04/19 22:06

5^F→suhorng:用什麼product rule等等等的rule去求微分61.217.33.29 04/19 22:07

6^F→suhorng:時前提都是"兩個微分都存在"之類61.217.33.29 04/19 22:07

7^F→suhorng:現在1/x在0的微分不存在也就不能用那些61.217.33.29 04/19 22:08

8^F→suhorng:chain rule, product rule等等等去求函數61.217.33.29 04/19 22:08

10^F→suhorng:在 0 的微分甚至連他存不存在都不知道61.217.33.29 04/19 22:08

11^F→suhorng:這種時候就用定義因為無計可施61.217.33.29 04/19 22:08

16^F→suhorng:對耶@@....61.217.33.29 04/19 22:15

17^F→suhorng:嘛我之前說用定義求微分也是錯的orz61.217.33.29 04/19 22:19

18^F→suhorng:沒有說在0的值是0...61.217.33.29 04/19 22:20

20^F→suhorng:lim x/sin(x) * cos(x) * x sin(1/x)61.217.33.29 04/19 22:30

21^F→suhorng:最後一個用夾擠...61.217.33.29 04/19 22:30

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