✔ 最佳答案
圖片參考:
http://i1191.photobucket.com/albums/z467/robert1973/Aug12/Crazytrigo2.jpg
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2012-08-09 16:22:35 補充:
Yes, the updated image has been uploaded as here:
s1191.photobucket.com/albums/z467/robert1973/Aug12/Crazytrigo3.jpg
Alternatively, case 3 can also be written as n >= 3