cosθcos3θ = cos7θcos5θ
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更新1:
Find the general solutions of equation. Give yr ans. in radian. the ans. should be nπ/8 , -nπ/4
F4 amath!!!
回答 (2)
2009-03-22 8:19 pm
✔ 最佳答案
cosθcos3θ = cos7θcos5θSolution:
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2009-03-22 6:40 pm
prove identity or solve equation?
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090322000051KK00004