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sinα是正弦,cosα是余弦.這些都是三角函數啊?同三角函數的基本關係式:1、倒數關係sinαcosα=1;cosαsecα=1;tanαcotα=12、商數關係tanα=sinα/cosα;cotα=cotα/sinα3、平方關係sin平方α+cos平…
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