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數學挑戰題I
2009-06-02 12:40 am
回答 (2)
2009-06-02 2:15 am
2009-06-02 2:05 am
提示: 考慮 sin3x = 3sinx - 4(sinx)^3 and
sin150 = sin(180-150) = sin30 = 0.5
sin150 = sin(180-150) = sin30 = 0.5
收錄日期: 2021-04-22 00:33:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090601000051KK00891