Compound angle ex(prove)
回答 (1)
2008-02-25 5:49 am
✔ 最佳答案
1-cos2x/sin2x=[1-(1-2sin^2x)]/2sinxcosx
=[2sin^2x]/2sinxcosx
=sinx/cosx
=tanx
=RHS
收錄日期: 2021-04-18 18:36:46
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https://hk.answers.yahoo.com/question/index?qid=20080224000051KK04911