標題: 我有一個trigonometry問題 [打印本頁]

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作者: iboss    時間: 2009-2-6 18:24     標題: 我有一個trigonometry問題

tan(A+B) = (tanA + tanB)/1-tanAtanB
If A is 90 deg, B is 10 deg.
sub A to RHS, tan90 occurs, so how to do it?

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作者: iboss    時間: 2009-2-8 10:25

Is there any proves ?

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