x=A(\theta-\sin{\theta})\\ y=A(1-\cos{\theta})
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  1. http://d.hatena.ne.jp/ykkpurple/touch/20110608/1307517600
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  4. http://d.hatena.ne.jp/ykkpurple/20110610/1307715598
  5. http://d.hatena.ne.jp/ykkpurple/20110608