Those lists aren't the same.  (1/4)*pi + 1 is equal to (pi+4)/4, not 
5*pi/4.  So I sure hope there's no way to "simplify" your first list into 
your second one.  If I add in one more term at beginning so that Sage can 
tell what the difference is between consecutive terms, I get something 
perhaps closer to what you want:

  sage: [pi/4, 5*pi/4, .. 12*pi]
  [1/4*pi, 5/4*pi, 9/4*pi, 13/4*pi, 17/4*pi, 21/4*pi, 25/4*pi, 29/4*pi, 
33/4*pi, 37/4*pi, 41/4*pi, 45/4*pi]

-- 
John

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