If A+B+C=90 , prove that tanAtanB+tanBtanC+tanCtanA=1
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F.4 A MATHS
2007-03-08 7:34 am
回答 (1)
2007-03-08 7:40 am
✔ 最佳答案
Please find as follows:圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Maths/Crazytrigo57.jpg
參考: My Maths knowledge
收錄日期: 2021-04-12 23:33:05
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https://hk.answers.yahoo.com/question/index?qid=20070307000051KK04762