In 三角形ABC, (tanA - tanB) / (tanA +tanB) = (c-b)/c
ai) Using the sine law, prove that acosB - bcosA = c-b
ii) Hence, by cosine law, prove that a^2 = b^2 + c^2 -bc
b) Find 角BAC
Application of trigonometry
2008-04-01 12:20 am
回答 (1)
2008-04-01 1:20 am
✔ 最佳答案
The Qs are solved as follows:圖片參考：http://i238.photobucket.com/albums/ff245/chocolate328154/Maths223.jpg?t=1206955230
參考: My Maths Knowledge
收錄日期: 2021-04-14 19:48:11
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