Please could you explain the solutions that are already posted for chapter 10.5, question 33. x = (

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Please could you explain the solutions that are already posted for chapter 10.5, question 33. x = (2 + sin v)cos u , y = (2 + sin v)sin u , z = u + cos v
Why does the direction of the coil reverse when you switch cosu with sinu and vice versa?

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