# 數學補習題目(續三角)一問

請解答下列網址的第五題(Q5.)： [第一步驟如何去到第二步驟]

### 1 Answer

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- Ka hoLv 57 years agoFavorite Answer
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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