Trigonometry (2) help~ quick
回答 (2)
2009-10-16 3:36 am
✔ 最佳答案
(tan @ / sin @) - (sin^2 @ / cos @)= [(sin@ / cos@) / sin@] - (sin^2 @ / cos@)
= (1 / cos@) - (sin^2@ / cos@)
= (1 - sin^2@) / cos@
= cos^2@ / cos@
=cos@
2009-10-21 3:41 am
收錄日期: 2021-04-21 22:04:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091015000051KK01025