數學補習題目(續三角)一問

2013-03-20 3:02 am
請解答下列網址的第五題(Q5.): [第一步驟如何去到第二步驟]

https://docs.google.com/document/d/1GYPN1AVRrmbpyrRdRaTtqvBumCQ-RDEbGCIFH0Qn5SQ/edit?usp=sharing&pli=1

回答 (1)

2013-03-20 3:30 am
✔ 最佳答案
cos(x+340) √ [ 1/cos^2 (x+340) - 1] = 1/2
√[ cos^2 (x+340) ] * √ [ 1/cos^2 (x+340) -1 ] = 1/2
√ [ 1 - cos^2 (x+340) ] = 1/2
√ [ sin^2 (x+340) ] = 1/2
±sin (x+340) = 1/2


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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130319000051KK00246

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