trigonometry(4)
2011-05-30 12:46 am
Let y=cos(π/15)cos(2π/15)cos(4π/15)cos(8π/15)Show that ysin(π/15)=(1/16)sin(16π/15)
回答 (1)
2011-05-30 1:20 am
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110529000051KK00819