(b) (5 分) What is ds， where C is the arc of the helix x = cost， y = sint， z = t， which joins the points (1， 0， 0) and (-1， 0， π)?
阿摩線上測驗
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ds， where C is the arc of the helix x = cost， y = sint， z = t， which joins the points (1， 0， 0) and (-1， 0， π)?