cos&sin:
http://www.tudou.com/programs/view/iOvYu9dSv5g/?bid=03&pid=02&resourceId=2998873_03_05_02&url_type=1&object_type=&pos=1 http://www.tudou.com/programs/view/vUGEJ6X9GSs/
http://www.tudou.com/programs/view/iOvYu9dSv5g/?bid=03&pid=02&resourceId=2998873_03_05_02&url_type=1&object_type=&pos=1
http://www.tudou.com/programs/view/vUGEJ6X9GSs/
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