標題: Maths question(Trigonometry) [打印本頁]

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作者: 秋山    時間: 2009-1-14 16:12     標題: Maths question(Trigonometry)

1. Solve (sinx+cosx)/(sinx-2cosx)=1/2 for 0ﾟ<x<360ﾟ

2. Prove cosx/(1-sinx)=(1+sinx)/cosx

3. Rewrite 3sin(^2)x-sinxcosx-1=0 in the form atan(^2)x+btanx+c+0, where a,b,c are integers.

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