98台大B 第六題
極座標平面上,兩曲線rΛ2=2cosΘ及r=2+2cosΘ有三個交點,
它們是原點及(r,Θ)=___或___。
我原本想說讓後面的式子平方後與前面相等就解得出來了,
可是根號中算出來是虛數,而且原點也根本不在曲線上,
是我算錯了嗎?
ps小弟第一次PO文,PO不好還請見諒!!
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.117.182.98
→
06/22 20:12, , 1F
06/22 20:12, 1F
→
06/22 20:22, , 2F
06/22 20:22, 2F
→
06/22 20:34, , 3F
06/22 20:34, 3F
→
06/22 20:35, , 4F
06/22 20:35, 4F
→
06/22 21:29, , 5F
06/22 21:29, 5F
推
06/22 22:46, , 6F
06/22 22:46, 6F
推
06/22 22:50, , 7F
06/22 22:50, 7F
→
06/22 22:52, , 8F
06/22 22:52, 8F
→
06/22 23:08, , 9F
06/22 23:08, 9F
推
06/22 23:16, , 10F
06/22 23:16, 10F
→
06/22 23:16, , 11F
06/22 23:16, 11F
→
06/22 23:16, , 12F
06/22 23:16, 12F
→
06/22 23:17, , 13F
06/22 23:17, 13F
→
06/22 23:26, , 14F
06/22 23:26, 14F
→
06/22 23:30, , 15F
06/22 23:30, 15F
推
06/22 23:49, , 16F
06/22 23:49, 16F
→
06/22 23:49, , 17F
06/22 23:49, 17F
→
06/22 23:50, , 18F
06/22 23:50, 18F
→
06/22 23:52, , 19F
06/22 23:52, 19F
→
06/22 23:52, , 20F
06/22 23:52, 20F
→
06/23 00:03, , 21F
06/23 00:03, 21F
→
06/23 00:03, , 22F
06/23 00:03, 22F
→
06/23 00:03, , 23F
06/23 00:03, 23F
→
06/23 01:02, , 24F
06/23 01:02, 24F
→
06/23 01:03, , 25F
06/23 01:03, 25F
→
06/23 01:04, , 26F
06/23 01:04, 26F
→
06/23 01:05, , 27F
06/23 01:05, 27F
→
06/23 01:13, , 28F
06/23 01:13, 28F
→
06/23 17:18, , 29F
06/23 17:18, 29F
→
06/23 17:18, , 30F
06/23 17:18, 30F
推
06/24 16:01, , 31F
06/24 16:01, 31F
→
06/24 16:04, , 32F
06/24 16:04, 32F
→
06/24 16:04, , 33F
06/24 16:04, 33F
→
06/24 16:04, , 34F
06/24 16:04, 34F
推
06/28 11:48, , 35F
06/28 11:48, 35F
→
06/28 11:48, , 36F
06/28 11:48, 36F