trigonometry prove

👨🏻‍🏫 學術台數學

[匿名]

2012-03-04 2:21 am

prove
secAsec2Asec4Asec8A=16sinA/sin16A

thanks

回答 (1)

用戶2053

2012-03-04 2:31 am

✔ 最佳答案

Using 2 sinA cosA = sin2A : cosA cos2A cos4A cos8A= sinA cosA cos2A cos4A cos8A / sinA= (1/2)sin2A cos2A cos4A cos8A / sinA= (1/4) sin4A cos4A cos8A / sinA= (1/8) sin8A cos8A / sinA= (1/16) sin16A / sinA= sin16A / (16sinA)SosecA sec2A sec4A sec8A = 16sinA / sin16A

👍 0 👎 0

收錄日期: 2021-04-21 22:23:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120303000051KK00558

檢視 Wayback Machine 備份