請化簡
1
___________- tan^2(90-[e])
cos^2(90+[e])
中四數學題
2010-11-15 6:55 am
回答 (2)
2010-11-15 8:21 pm
✔ 最佳答案
請化簡１
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＝Ｃｓｃ^2 （〔ｅ〕） ─ Ｃｏｔ^2 (〔ｅ〕）
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2010-11-15 3:11 pm
1
- tan^2(90-[e])/cos^2(90+[e])
= [-(sin^2 (90- [e])/(cos^2 (90 - [e])]/cos^2 (90 +[e])
= [-sin^2 (180 - 90 + [e])/(cos^2 (90-[e])]/ sin^2 ([e]
= [-sin^2 (90 + [e])/sin^2 [e])/sin^2 [e]
= -cos^2 [e]/sin^4 [e]
- tan^2(90-[e])/cos^2(90+[e])
= [-(sin^2 (90- [e])/(cos^2 (90 - [e])]/cos^2 (90 +[e])
= [-sin^2 (180 - 90 + [e])/(cos^2 (90-[e])]/ sin^2 ([e]
= [-sin^2 (90 + [e])/sin^2 [e])/sin^2 [e]
= -cos^2 [e]/sin^4 [e]
參考: Hope the solution can help you^^”
收錄日期: 2021-04-13 17:38:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101114000051KK01840