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三角函數包含六種基本函數:正弦、餘弦、正切、餘切、正割、餘割.如:在直角三角形ABC中,a、b、c分別是角A、角B、角C的對邊,角C為直角.則定義以下運算方式:sin角A=角A的對邊長/斜邊長,sinA記為角A的正弦.
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