(a)find tanθ in term of k.
(b)Hence find 1/cosθ - tanθ.
更新1:
(b)Hence find 1/cos²θ - tan²θ.
(b)Hence find 1/cos²θ - tan²θ.
收錄日期: 2021-04-23 20:32:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080407000051KK01614