作者pobm (待从头收拾旧河山)
看板trans_math
标题[多变] 一题切平面
时间Wed Jul 11 00:36:15 2007
Suppose that a thin spiral ramp (helicoid) H, given by the parametric
equation r(u,v) = < vcosu,vsinu,u >, o<u<2pi, 0<v<2, find the equation of
the tangent plane to H at
3^(1/2) 3 pi
(x,y,z)=(-------,---,-----)
2 2 3
谢谢^^
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 61.229.149.83
1F：推 HUJIKOLP:外积球法向量140.116.117.206 07/11 02:53
2F：推 ht15trep:(r'u)×(r'v)，这样吧 124.8.6.93 07/11 09:21