1) 1+tan^2(180˚-θ) = 1/cos^2θ ?
2) 2sin(270˚-θ)cos240-2sin120˚cos(180˚-θ) = (√3-1)sinθ?
F.4 MATHS TRIGO QUEST~
2010-05-31 3:01 am
回答 (1)
2010-05-31 4:03 am
✔ 最佳答案
As follows:圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/07-24.jpg
2010-05-30 20:48:17 補充：
tan^2(180˚-θ)=(-tanθ)^2=tan^2(θ)
收錄日期: 2021-04-16 13:29:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100530000051KK01311