在数学中sin，cos，tg，ctg分别表示； sina= (∠a的对边)/ (∠a的斜边)，cosa= (∠a的邻边)/ (∠a的斜边)。一种是tan,一种就是tg了,我们现在常用tan,多用tg表示正切函数，ctg表示余切函数现在.
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