Quod Erat Demonstrandum

2008/11/10

正割餘割

Filed under: Additional / Applied Mathematics,HKCEE — johnmayhk @ 9:26 下午
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中四開新課,同學認識一下新「朋友」吧:

正弦 = sine (\sin)
餘弦 = cosine (\cos)
正切 = tangent (\tan)
餘割 = cosecant (\csc) 定義:\csc\theta \equiv \frac{1}{\sin\theta}
正割 = secant (\sec) 定義:\sec\theta \equiv \frac{1}{\cos\theta}
餘切 = cotangent (\cot) 定義:\cot\theta \equiv \frac{1}{\tan\theta}

我今天才知「正割」「餘割」這兩個譯名,慚愧。

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