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5,11,14,17,19
不用做20
5條 maths 一定要詳細解答plz
2009-04-13 6:55 am
回答 (1)
2009-04-13 8:02 am
✔ 最佳答案
圖片參考：http://g.imagehost.org/0371/ScreenHunter_05_Apr_12_23_56.gif
(b)
sin(180 o +θ)cos2(360 o -θ)+sin3(360 o -θ)
=(-sinθ)(cos2θ)-sin3θ
=(-sinθ)(1-sin2θ)-sin3θ
=-sinθ+ sin3θ- sin3θ
=-sinθ
14(a)
L.H.S.=tanA
=tan[180o-(B+C)]
=-tan(B+C)
=R.H.S.
(b)
圖片參考：http://g.imagehost.org/0930/ScreenHunter_06_Apr_12_23_59.gif
2009-04-13 00:04:10 補充：
17)
sinθcosθ=2/5
收錄日期: 2021-04-23 20:42:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090412000051KK02049