A,Maths,.,,,HElp
SIN^2 X = 1
------------ -----
2+7COS^2 X 9
show step plz,,,,HElp
thanks
A,Maths,.,,,HElp
2007-11-13 3:59 am
回答 (1)
2007-11-13 7:41 pm
✔ 最佳答案
sin2 x / (2 + 7cos2 x) = 1/99sin2 x = 2 + 7cos2 x
9sin2 x = 2 + 7(1 - sin2 x)
9sin2 x = 2 + 7 - 7sin2 x
16sin2 x = 9
sin2 x = 9/16
sin x = ±3/4
For 0 ≦ x ≦ 2π,
x = 0.848, 2.294, 3.990 or 5.435
參考: My Maths knowledge
收錄日期: 2021-04-13 14:29:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071112000051KK03256