2sinAcosA=sin2A，點解﹖

用戶157373

2007-06-23 9:45 pm

點樣證明﹖

回答 (1)

[匿名]

2007-06-23 9:49 pm

✔ 最佳答案

RHS
=sin2A
=sin(A+A)
=sinAcosA+sinAcosA
=2sinAcosA
=LHS

參考: i'm a F.4 student

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