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作者 sexysam 在 PTT [ trans_math ] 看板的留言(推文), 共32則
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1F→:屠龍寶刀是觀念書籍 可以買來看看140.112.241.48 02/17 21:55
2F→:但是考試不夠用140.112.241.48 02/17 21:55
3F推:推偉文台中班140.112.241.48 02/17 21:54
1F推:代t=tan(Θ/2)試試140.112.241.48 12/17 23:25
2F→:由三角函數關係cosΘ=(1-t^2)/(1+t^2)140.112.241.48 12/17 23:27
3F→:sinΘ=2t/(1+t^2)140.112.241.48 12/17 23:27
4F→:dΘ=2dt/(1+t^2)140.112.241.48 12/17 23:28
5F→:全部代進去應該就可以積了140.112.241.48 12/17 23:28
8F推:冏 我自己也算好久 應該有比較快的= =140.112.241.48 12/17 23:34
13F推:好強的定理 沒看過= =!140.112.241.48 12/17 23:38
16F推:z是複數?140.112.241.48 12/17 23:40
28F推:強者!!140.112.241.48 12/18 00:02
1F推:題目沒定義好 有可能v=v(y)140.112.241.48 12/18 00:05
3F推:用極座標只有考慮到一條逼近方法140.112.241.48 12/17 23:53
4F→:極限要存在任意路徑和任意方向都要存在140.112.241.48 12/17 23:55
5F→:所以通常只會叫你證明他不存在140.112.241.48 12/17 23:55
4F推:面積(A)*型心繞軸(x=y)所走的距離140.112.241.48 12/15 22:57
6F→:型心到軸距離r 旋轉體體積=2拍rA140.112.241.48 12/15 22:58
3F推:這是偏心圓 r的範圍0~cosΘ140.112.241.48 12/15 22:50
4F→:更正 是0~2cosΘ140.112.241.48 12/15 22:52
5F→:冏 下面有人回文了...140.112.241.48 12/15 22:52
6F→:還是沒人回答到他= =140.112.241.48 12/15 21:49
7F→:二次微分就是一次微分的變化率阿140.112.241.48 12/15 21:50
8F→:所以二次微分可以看斜率變大或小140.112.241.48 12/15 21:50
9F→:斜率有變化就會造成凹口了阿140.112.241.48 12/15 21:53
6F推:回1樓 因為X^2的分子可能為AX+B140.112.241.48 12/13 21:41
7F→:再拆開就變成X和X^2兩項140.112.241.48 12/13 21:42
3F推:分部積分 udv=uv-vdu140.112.241.48 12/13 21:39