Verifying Identities
sinθ cos^2θ - cos^3θ + sin^2θ cosθ - sin^3θ = sinθ + cosθ
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2 sinθ cosθ - 1
令左邊既分數等於 sinθ + cosθ
trigonometry problem
2008-01-15 11:18 pm
回答 (1)
2008-01-15 11:43 pm
參考: ME
收錄日期: 2021-04-26 14:21:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080115000051KK01649