[2) Compute the normal vector for 'v = 0

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[2) Compute the normal vector for 'v = 0. That is, compute N (u, 0). (a) Sketch N(u,0) on M. (b) Observe that N
(u, 0) varies continuously for 0 S u S 21?, moving once along 0. However, show that N(21r,0) = —N(D, 0). ((3)
Explain why this implies that M is not orientable.