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從一方面來說,假如角α不是銳角,都可以通過公式給轉變成銳角啊,像85度,可以看成90-5再用誘導公式轉化.另一個角度,你還是對誘導公式的推理不太理解,可能老師沒有在課堂上給你證明,你可以運用三角函數的定義和三角函數...
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