cos (theta + alpha) = p
sin (theta + beta) = q
PROVE THAT p^2 + q^2 + 2pq sin (alpha-beta) = cos^2 (alpha - beta)
TRIGONOMETRY
2011-06-06 7:10 am
回答 (1)
2011-06-06 7:35 am
收錄日期: 2021-04-11 18:40:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110605000051KK01071