[多變] 一題切平面
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
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