作者jonerty (寶爺)
看板trans_math
標題[考古] 中興91
時間Tue Jul 5 22:16:38 2005
1.
find a function f and a constant c such that
x
S tf(t) dt=sinx-xcosx-1/2(x^2),for all x.
c
這題怎麼找他的常數C阿...快瘋了...
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 59.121.139.39
1F：推 amymayyam:我在想是不是洛爾定理.....140.127.179.227 07/05
2F：→ amymayyam:先兩邊微分吧 然後用洛爾的樣子....140.127.179.227 07/05
3F：推 iamseed:c=0嗎 還是.. 61.216.131.193 07/05
4F：推 wakke:sinc-ccosc-1/2c^2=0 so c=0 61.228.32.114 07/05
5F：推 iamseed:跟我想的一樣 ｘ＝ｃ積分等於０ 61.216.131.193 07/05
6F：推 amymayyam:不是兩邊微分 c帶進去 讓f(c)=0?140.127.179.227 07/05
7F：推 wakke:直接帶c左邊就等於0了阿 61.228.32.114 07/05