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在直角三角形ABC中,∠C=90º;,斜邊AB=c,兩直角邊BC=a,AC=b ∠A的對邊/斜邊=∠A的正弦,記為:sinA=a/c ∠A的鄰邊/斜邊=∠A的余弦,記為:cosA=b/c ∠A的對邊/∠A的鄰邊=∠A的正切,記為:tanA=a/b 同理有∠B的銳角三角函數.
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