( A + B + C = 180度 )
1.
sin A + sin B + sinC = ?
2.
sin 2A + sin 2B + sin 2C = ?
2007-02-21 09:10:45 · 2 個解答 · 發問者 J 7 in 科學 ➔ 數學
1.
轉至 _ cos _ cos_cos_
2.
轉至 _ sin _ sin_ sin_
2007-02-21 09:17:23 · update #1
1)
圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Maths/Crazytrigo12.jpg
2)
圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Maths/Crazytrigo13.jpg
2007-02-21 18:02:15 · answer #1 · answered by 魏王將張遼 7 · 0⤊ 0⤋
1. 2.598076211
2. 2.598076211
2007-02-21 09:15:42 · answer #2 · answered by Jason 1 · 0⤊ 0⤋