[多變] 一題切平面

[pobm (待從頭收拾舊河山)]

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

謝謝^^

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推 HUJIKOLP:外積球法向量
推 ht15trep:(r'u)×(r'v)，這樣吧