Question: 3. Let x(u,v) = ((R+r cos u) cos v, (R+r cos u) sin v, r sin u) be the usual parametrization of a torus.

3. Let x(u,v) = ((R+r cos u) cos v, (R+r cos u)

3. Let x(u,v) = ((R+r cos u) cos v, (R+r cos u) sin v, r sin u) be the usual parametrization of a torus. Determine whether the v-parameter curve, u = 0, of x is principal, asymptotic and geodesic. [25]

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