證明(sin@+cos@0^2-2tan@cos@^2=1 F.3 math
回答 (1)
2008-06-15 10:38 pm
✔ 最佳答案
證明(sin@+cos@)2-2tan@cos2@=1 左方=(sin@+cos@)2-2tan@cos@2
=(sin2@+cos2@+2sin@cos@)-2sin@cos@
=(1+2sin@cos@)-2sin@cos@
=1
=右方
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https://hk.answers.yahoo.com/question/index?qid=20080615000051KK00746