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不需要知道和记得啊 当场推一下也不困难 反正就是不要用sin就是了

Posted by cuiaoxiang at 2008-05-07 16:20:18 on Problem 3587
In Reply To:很明显就是有人不知道/不记得这个公式 Posted by:frkstyc at 2008-05-07 15:39:24


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