sinX + cosX = 3/4
(sinX)(cosX)=???
maths.......
2008-04-10 7:07 pm
回答 (1)
2008-04-10 7:12 pm
✔ 最佳答案
sin x + cos x = 3/4Squaring both sides,
sin2 x + 2 sin x cos x + cos2 x = 9 / 16
1 + 2 sin x cos x = 9 / 16
2 sin x cos x = - 7 / 16
sin x cos x = - 7 / 32
參考: My Maths Knowledge
收錄日期: 2021-04-13 16:42:52
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080410000051KK00602