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Statement of a problem № m159

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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)).




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