let y = -4tan^2θ/1+2tan^2θ+tan^4θ
a)show that y= -1/1+cot^2 2θ
b) hence find the minimum value of y
F.4 TRIGONOMETRY M2
2011-03-17 7:39 am
回答 (1)
2011-03-17 8:24 am
✔ 最佳答案
As follows:圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/ScreenHunter_05Mar170023.gif
收錄日期: 2021-04-22 00:55:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110316000051KK01369