Using
cosx ~ 1- (1/2)x^2
Show that
secx ~ 1+(1/2)x^2
Math Qn Show secx ~ 1+(1/2)x^2
2009-06-01 3:13 am
回答 (1)
2009-06-01 3:41 am
✔ 最佳答案
cosx~1- (1/2)x^21/cosx~1/[1- (1/2)x^2]
Using 1/(1-x)=1+x+x^2+...
We have secx~1+(1/2)x^2+....
收錄日期: 2021-04-26 14:03:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090531000051KK01667