[向量]Parametric equation

[midmidman (串男)]

Identify the surface with the given vector equation.

r(x,a)=<x,cos a,sin a >

首PO謝謝~

answer= Circlar cylinder with axis the x-axis.

請幫我解釋謝謝~

還有因為r(x,a)=<x,cos a,sin a >
所以他的r0是不是等於(0,0,0)??

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