# Question

a. If c: [0, 2π] x [-1, 1] → c: [0 , 2π] x [-1, 1] → R3 is defined by
c (u,v) = (2 eos (u) + vsin (u/2) eos (u),

2sin (u) + vsin (u/2) sin (u), veos (u/2)).

2sin (u) + vsin (u/2) sin (u), veos (u/2)).

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