18)(1+cosθ/sin^2θ)- 1/1-cosθ
27) tan28=1/tan(θ-24)
D2題都要有步驟
收錄日期: 2021-04-14 20:33:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080318000051KK03662