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arc length of (x,y,z)=((1-t/48/pi)*6*cost,(1-t/48/pi)*6*sint,t/4/pi) from 0 to 48pi
arc length of (x,y,z)=((1-t/48/pi)*6*cost,(1-t/48/pi)*6*sint,t/4/pi) from 0 to 48pi
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