a) Prove that sinθ / cscθ - cot θ = 1 + cosθ
b)Prove that (sinθ / 1+cosθ) + (1+cosθ / sinθ) = 2cscθ
數學!!!HELP please
2010-10-17 11:07 pm
回答 (1)
2010-10-17 11:22 pm
✔ 最佳答案
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2010-10-17 15:22:48 補充：
http://img832.imageshack.us/img832/6118/71063714.png
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https://hk.answers.yahoo.com/question/index?qid=20101017000051KK00895