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高二數學-正弦餘絃
Sep 7th 2013, 10:02

Michelle,也可以這樣計:
http://imgcld.yimg.com/8/n/HA00430218/o/20130907184423.jpg

但是你題目說正弦餘絃定理,所以我相信題目可能希望用螞蟻雄兵 ( 知識長 )的方法去解題。

那以上的就當作是你的參考吧。

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