作者查詢 / suhorng
作者 suhorng 在 PTT [ trans_math ] 看板的留言(推文), 共282則
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11F推:ξ=ξ(△x) 是 △x 的函數...118.166.44.85 08/10 00:08
5F→:嗯嗯!118.166.46.246 08/13 23:03
1F→:Δy/Δx = 斜率這只有直線才一定對118.166.44.85 08/08 23:13
2F→:你可以看成當 f'(a) 存在時 f 在點118.166.44.85 08/08 23:13
3F→:(a,f(a)) 的斜率就是 f'(a) 這個為"定義"118.166.44.85 08/08 23:13
4F→:當 f'(a) 不存在時就沒有斜率118.166.44.85 08/08 23:14
1F→:這樣寫要小心 因為等號其實是不對的118.166.52.102 08/05 11:04
2F→:我是說寫 lim 這樣不太好118.166.52.102 08/05 11:05
1F→:經驗, 觀察, 猜測118.166.52.102 08/05 01:02
2F→:若極限存在 那無論由怎樣的路徑逼近原點118.166.52.102 08/05 01:02
3F→:都應該要得到一樣的極限值118.166.52.102 08/05 01:02
4F→:因此若能找到兩條逼近的路徑 他們出來的值118.166.52.102 08/05 01:03
5F→:不同 那肯定極限不存在118.166.52.102 08/05 01:03
8F推:重點是這積錯了....答案不是那個....118.166.44.240 07/21 13:49
10F推:因為沒有closed form, 題目才問近似值的118.166.44.240 07/21 19:56
11F→:轉成極座標後 積分區域跟積到∞的情形不同118.166.44.240 07/21 19:56
14F推:∫exp(-x^2)dx 不是初等函數的有限組合能118.166.44.240 07/21 21:11
15F→:表達的. 算式中列出 I^2 到最後 = π..118.166.44.240 07/21 21:12
16F→:之間的步驟有錯.118.166.44.240 07/21 21:12
17F→:當然∫_0^∞ exp(-x^2)dx = √π/2 這特例118.166.44.240 07/21 21:13
1F→:第一題用半角代換118.166.53.175 07/11 17:00
9F推:而且他是交錯級數118.166.53.175 07/11 10:47
3F推:z-3-9-1 (math)118.166.45.240 07/09 21:00
5F→:嗯...你會重積分&重積分變數變換嗎?118.166.45.240 07/09 22:39
6F→:喔 那個是指 Math 板精華區 3-9-1118.166.45.240 07/09 22:40
9F→:那麼, 他的做法就是, 平方變成重積分,118.166.45.240 07/09 23:04
10F→:然後轉到極座標積出來.118.166.45.240 07/09 23:04
11F→:把它乘進去是因為是個常數 可以乘進去118.166.45.240 07/09 23:04
1F推:∫ln(1+x^2dx=xln(1+x^2-∫x*2x/(1+x^2)dx61.217.34.242 07/06 22:43
2F→:∫x^2/(1+x^2)dx=∫(1 - 1/(1+x^2))dx61.217.34.242 07/06 22:44