1/3<=((secX)^2-tanX)/((secX)^2+tanX)<=3
X不等於180度乘k, k=0,1,2..
更新1:
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F4 A.MATH 問題
回答 (3)
2008-04-15 7:03 pm
✔ 最佳答案
The Q is proved as follows:圖片參考：http://i238.photobucket.com/albums/ff245/chocolate328154/Maths236.jpg?t=1208228624
參考: My Maths Knowledge
2008-04-24 7:24 pm
證明下列不等式:
1/3<=((secX)^2-tanX)/((secX)^2+tanX)<=3
X不等於180度乘k, k=0,1,2..
1/3<=((secX)^2-tanX)/((secX)^2+tanX)<=3
X不等於180度乘k, k=0,1,2..
2008-04-15 9:25 pm
你不用圖的話就更好了
收錄日期: 2021-04-26 13:04:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080415000051KK00515