1)prove sin^2ө/(1-cosө)=1+cosө
2)The figure shows sector OABCD.
∩ : ∩ : ∩ = 1:3:5.AC and BD intersect aT P.
AB BC CD
a)Find angle AOBand angle BOC.
b)Find angleOAD
c)Find angle CAD
f4.maths
2008-03-25 7:12 am
回答 (1)
2008-03-26 6:49 pm
✔ 最佳答案
1)prove sin^2ө/(1-cosө)=1+cosөsin^2ө
= 1-cos^2ө
= (1+cosө)(1-cosө)
Therefore,
sin^2ө/(1-cosө)=1+cosө
收錄日期: 2021-04-13 15:21:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080324000051KK03927