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( 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

2 個解答

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

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