[微積] 求點問題

看板Math作者 (隨便)時間13年前 (2012/03/26 21:28), 編輯推噓5(5推 0噓 9→)
留言14則, 5人參與, 最新討論串1/1
Find the equation of tangent lines at the point where the curve cross itself ex. x=2sin2t y=3sint 想很久但是詳解上就直接寫那個點是(0,0) 請問要怎麼找呢?? 還是只能用做圖的= = -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.120.226.210
推
03/26 21:54, , 1F
tangent lines at the point where the curve cross
03/26 21:54, 1F
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03/26 21:54, , 2F
itself?? 這聽起來像是領結這種圖形。
03/26 21:54, 2F
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03/26 22:06, , 3F
所以要怎麼找阿= =
03/26 22:06, 3F
推
03/26 22:14, , 4F
意思是你的ex畫起來沒有交叉啊
03/26 22:14, 4F
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03/26 22:14, , 5F
喔 有 我搞錯了...sorry
03/26 22:14, 5F
推
03/26 22:20, , 6F
t代0和pi,位置都一樣 有不同斜率
03/26 22:20, 6F
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03/26 22:25, , 7F
那只能這樣直視嗎 有其他得方法嗎 ex.x=t^3-6ty=t^2
03/26 22:25, 7F
推
03/26 22:25, , 8F
可是只有(0, 0)
03/26 22:25, 8F
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03/26 22:25, , 9F
要怎麼做阿 實在搞不太懂 先謝謝各位的幫助囉!!
03/26 22:25, 9F
推
03/26 22:26, , 10F
x=4sin(t)cos(t), y=3sin(t)
03/26 22:26, 10F
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03/26 22:26, , 11F
x1=x2,y1=y2 <=> cos(t1)=cos(t2)
03/26 22:26, 11F
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03/26 22:27, , 12F
or sin(t1)=sin(t2)=0
03/26 22:27, 12F
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08/13 16:44, , 13F
or sin(t1)= https://noxiv.com
08/13 16:44, 13F
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09/17 14:41, , 14F
tangent lin https://daxiv.com
09/17 14:41, 14F
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